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(1) The figure formed by the minute hand of the clock rotating one circle is () (2) the line segment from () to () is called radius (3) The line segment that passes through () and () is called diameter (4). In the same circle, all radii () are equal, and () whose diameter is equal to radius is also equal. (5) use a compass to draw a circle with a diameter of 20cm, and the distance between the two feet of the compass is () cm. (6) a circle is a () figure, which has () axis of symmetry. (7) a square has () axis of symmetry, and a rectangle has () axis of symmetry（ ）(8) the circumference of a circle is () times of the diameter of the same circle. (9) the radius of a circular fish pond is 10 meters. If you walk around it once, you have to walk () meters. (10) the length of the hour hand of a wall clock is 5 cm, (11) when drawing a circle, the distance between the two feet of the compass is the circle () (12) the line segment with both ends on the circle, () is the longest. (13) the ratio of the radius to the diameter of the circle is () (14) the radius of the small circle is 6cm, the radius of the big circle is 9cm. The ratio of the diameter of the small circle to the diameter of the big circle is (), (15) the radius of the circle is 7 cm, its circumference is () cm, the diameter of the circle is 13 m, its circumference is () M. the circumference of the circle is 75.36 decimeters, its radius is () decimeters. (16) a wire hoop should be put on the outside of the cylindrical bucket with a bottom half diameter of 14 cm, and the joint part is 6 cm, Use wire () cm (17) to draw a circle with a compass. If the distance between the two feet of the compass is 6cm, the circumference of the circle drawn is () cm. (18) when drawing a circle, the fixed point is () cm. (19) the radius from the center of the circle to any point on the circle is () cm. (20) the circumference is () cm. (21) the diameter and length of the circle determine () cm
(1) The figure formed by the minute hand of a clock rotating one circle is (circle) (2) the line segment from (center of circle) to (circle) at any point is called radius
(3) (4) in the same circle, all radii (equal) and all (diameter) are equal, and the diameter is equal to (twice) of the radius. (5) draw a circle with a diameter of 20 cm with a compass, and the distance between the two feet of the compass is (10) cm. (6) a circle is (axisymmetric) figure, which has (countless) ）Axis of symmetry (7) square has (4) axes of symmetry, rectangle has (2) axes of symmetry, isosceles triangle has (1) axes of symmetry, equilateral triangle has (3) axes of symmetry, semicircle has (1) axes of symmetry, isosceles trapezoid has (1) axes of symmetry. (8) the circumference of a circle is (3.14) times of the diameter of the same circle. (9) the radius of a circular fish pond is 10 meters, If you walk around it, you have to walk (62.8) meters. (10) the hour hand of a wall clock is 5 cm long, and the tip of the hour hand moves (31.4) cm in a day and night. (11) when drawing a circle, the distance between the two feet of the compass is the radius of the circle. (12) the line segment with both ends on the circle is the longest. (13) the ratio of radius to diameter of the circle is (1:2), and the ratio of circumference to diameter of the circle is (3.14:1) ）(14) the radius of the small circle is 6cm, and the radius of the big circle is 9cm. The ratio of the diameter of the small circle to the diameter of the big circle is (2:3), the ratio of the circumference of the small circle to the circumference of the big circle is (2:3). The ratio of the area of the small circle to the circumference of the big circle is (4:9) (15) the radius of the circle is 7cm, its circumference is (43.96cm), the diameter of the circle is 13m, its circumference is (40.82m). The circumference of the circle is 75.36decimeter, Its radius is (12) decimeters. (16) a wire hoop should be put on the outside of a cylindrical bucket with a bottom radius of 14 cm. The joint part is 6 cm. The wire is (93.92) cm. (17) a circle should be drawn with a compass. If the distance between the two feet of the compass is 6 cm, the circumference of the circle drawn is (37.68) cm. (18) when drawing a circle, A fixed point is called the center of a circle. (19) the length from the center of a circle to any point on the circle is called the radius. (20) the ratio of circumference to diameter of a circle (21) the diameter and length of a circle determine the size of a circle
The clock of a clock is 6 cm long. How many cm does the tip of the minute hand walk in a day and night? The figure formed by the minute hand rotating for one week
If the minute hand is 6cm long
The tip of the minute hand has gone: 3.14 × 6 × 2 × 24 = 904.32 cm
The area of the figure formed by one revolution of the minute hand is 3.14 × 6 × 6 = 113.04 square centimeter
The minute hand of a clock is 5cm long. After 2 hours, how many centimeters does the tip of the minute hand travel?
2 × 3.14 × 5 × 2, = 6.28 × 10, = 62.8 (CM); a: the distance of the minute hand tip is 62.8 cm
The minute hand of a clock is 60 mm long, so how many mm is the distance that the minute hand tip turns 5 turns?
Circumference of five clock faces with a radius of 60 mm
5 × 2 × 3.14 × 60 = 3.14 × 600 = 1884 mm
The minute hand of a clock is 40mm long. After one hour, what is the distance of the minute hand tip? Write the formula
In fact, it is to calculate the circumference of a circle with a radius of 40 mm
C = 2πR = 2 * 3.14 * 40 = 251.2 mm
The length of the minute hand of a wall clock is 20cm. After 30 minutes, what is the distance of the tip of the minute hand
c=2πr=2×3.14×20×30/60
=20×3.14
=62.8
c=2πr=2×3.14×20×45/60
=30×3.14
=94.2
The minute hand of a clock is 5cm long. What is the 24-hour journey of the minute hand tip?
7.2km
There is a wall clock that rings twice an hour, several times at what time and once every half an hour. How many times does this clock ring day and night?
It was mentioned by a friend
If calculated by 12 hours, (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12) * 2 + 24 = 102 times! Ring once in half an hour! That's what my clock is like!
If calculated by 24 hours, it is (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 +. 24) + 24 = 324
Lingling's clock strikes twice an hour, several times at what time, and once in half an hour. How many times does the clock strike in a day and a night/
(1+2+3+4+5+6+7+8+9+10+11+12)*2+24
=13*6*2+24
=156+24
=180
Xiao Ming's family hung up a clock and struck it twice an hour: at what time and in half an hour. Think about it, how many times does this clock strike in a day and a night?
2×（1+2+3+… +12 + 12) = 2 × (1 + 12) × 122 + 24 = 180
RELATED INFORMATIONS
- 1. Xiao Ming's family hung up a clock and struck it twice an hour: at what time and in half an hour. Think about it, how many times does this clock strike in a day and a night?
- 2. If the clock strikes at every hour, the number of times it strikes is equal to the number of the clock points, and it strikes at every half hour, then the clock strikes day and night______ Next
- 3. The length of the hour hand of a clock is 14 cm. After a day and a night, how many cm is the distance that the point of the hour hand passes
- 4. When is the first time that the hour hand and the minute hand coincide?
- 5. The conclusion of the experiment of measuring the acceleration of the car with the clock
- 6. A question about using the successive difference method to calculate acceleration Can I use a = (x6 + X4 + x2-x5-x3-x1) / 3t2 to calculate the acceleration? Can I use all the data?
- 7. For a two digit number, its ten digit number plus seven times of the one digit number is still equal to the two digit number. Such a two digit number has () A. One B. two C. three D. four
- 8. Xiao Ming's wall clock is slow every hour. At 8 a.m., Xiao Ming sets the clock at the standard time. At 12 noon, what's the standard time?
- 9. Xiao Ming and his father go to the park to play. Xiao Ming wants to make a plane. Today is children's day. Xiao Ming has half a ticket. His father paid 20 yuan in total and recovered 2 yuan. How much is the ticket price for Xiao Ming and his father
- 10. Xiao Gang has several pieces of RMB 5 yuan and RMB 2 yuan. She wants to take out 43 yuan. How many different ways are there? (list all the ways)
- 11. LAN LAN and Tian Tian fold a thousand paper cranes together. Lan Lan says to Tian Tian, "you fold 1 / 5 less than me." Tian Tian says to LAN LAN, "if you give me your 1 / 6, I'll have four more than you." please calculate how many thousand paper cranes LAN LAN has folded?
- 12. The charging standard of a local telephone is: 30 cents for the first five minutes, and 20 cents for every minute after that. Uncle Wang pays 2 yuan and 70 cents after a call, and he calls for () minutes at most?
- 13. This year, the age of father and daughter is 52 years old. Six years later, the age of father is three times that of daughter. What are the ages of father and daughter?
- 14. There are three people in the family. My father is three years older than my mother. Now the total age of the family is 80 years old. Ten years ago, the total age of the whole family was 51 years old. My daughter is now 80 years old______ I'm 40 years old
- 15. I want to ask some math questions Find the rules and fill in the numbers: 0, 3, 8, (), (), 35
- 16. Yesterday afternoon, Mr. Zhang assigned a math problem. In the evening, I racked my brains and couldn't figure out how to solve it, Fill in a poem My grandfather's 70th birthday is congratulated by all my relatives and friends. I wish my grandfather happiness and longevity. But my grandfather sighed () I'll stop him soon () grandfather, your body is stronger than young people!
- 17. If there are two ways to charge mobile phone: the first way, the user's monthly phone fee: 10 yuan monthly rent plus 0.4 call fee per minute; The second way, the user's monthly fee: 25 yuan per month plus 0.2 yuan per minute 1. How long is the call time per month, and how much is the call cost of the two modes? Due to business needs, boss Zhang calls no less than 3 hours a month. Please help him figure out which one is cost-effective
- 18. The following table shows the time difference between several cities and Beijing (the number with a plus sign indicates the time earlier than Beijing time at the same time) paris-7 Tokyo + 1 new york-14 If Beijing time is 8 p.m., what's Paris time? If it's 8:00 p.m. Beijing time and Xiao Ming is calling his friends in New York, do you think it's appropriate? There should be a formula
- 19. The charge standard of a taxi company is 6 yuan within a kilometer, and 1.2 yuan per kilometer for the part more than 3 kilometers (1 kilometer for less than 1 kilometer). Xiao Zhang has to go to a place 6.5 kilometers away, and he should pay if he rents the car of a company_____ element Company B doesn't charge the starting price. It should be paid outside 6.5________ element If he goes 9.6 kilometers away, should he choose car a or B?
- 20. The charging standard of a city's taxi country is that the starting price of 3 km (including 3 km) is 5 yuan, and 2.4 yuan is added for every kilometer beyond 3 km. A passenger takes this taxi for X km. The formula of X is used to express the passenger's payment