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The circumference of a circle is 2 μ R, and the circumference of a semicircle is?
The circumference of a circle equals 2 R, and the circumference of a semicircle equals ()
Pie R + 2R
The circumference of a circle is 2 μ R, and the circumference of a semicircle is ()
Pie R
RELATED INFORMATIONS
- 1. Find the difference between the perimeter and area of two circles r = 4cm and d = 18cm
- 2. The area of a circle is half of that of a semicircle. The circumference of a circle is 18.84 cm. How many cm is the circumference of a semicircle The area of a circle is half of that of a semicircle. The circumference of a circle is 18.84 cm. What is the circumference of a semicircle?
- 3. The radius of a circle is 5cm. If the radius is doubled, the diameter will be doubled, the circumference will be doubled, and the area will be doubled Just expand () times, is () square centimeter?
- 4. 1. If the perimeter difference of two circles is 6.28cm, and the diameter of the big circle is three times of the radius of the small circle, the area of the small circle is 2. The radius of the small circle is 1 / 5 of the radius of the big circle, the circumference of the big circle is 5 / 5, and the circumference of the small circle is meter 3. The sector area is 57 decimeters & sup2;, and the center angle is 46 degrees. When the center angle increases to 92 degrees, the sector area increases by decimeters & sup2;
- 5. The circumference of a semicircle is 25.7 cm. How many square centimeters is its area?
- 6. The minute hand of a clock is 10 cm long and the hour hand is 8 cm long 1. From 12:00 to 2:00, how many cm does the minute needle tip pass? From 6:00 in the morning to 6:00 in the afternoon, how many cm does the hour needle tip pass? 2. What is the area swept by the clock from 6 am to 6 pm? What is the area swept by the clock from 12 am to 6 pm?
- 7. Who knows how to calculate the perimeter and area of a semicircle
- 8. In the figure below, the circumference of big circle and small circle are 31.4cm and 25.12cm respectively
- 9. Fill in the blanks: the circumference of a semicircle is 25.7cm, and its area is () square centimeter
- 10. The perimeter difference between the two circles is 12 cm. It is known that the ratio of the perimeter of the small circle to that of the large circle is 25:81, so what is the area of the small circle
- 11. The formula of 2 π R is to find the circumference of a circle. How to find the circumference of a semicircle It's a semicircle
- 12. Use 51.4cm wire to form a semicircle. What's the area of the semicircle? Besides, shouldn't the circumference of the semicircle be π D + D?
- 13. Given the circumference of the semicircle, the formula of area
- 14. If the circumference of a circle is known to be 4 π, find its area
- 15. For a ring, the sum of the circumference of the inner ring and the outer ring is 157cm. The difference between the circumference of the inner ring and the outer ring is 31.4cm, and the area of the ring is larger
- 16. It is known that the circumference of the sector is 10 and the arc length is L. the functional relationship of the sector area with respect to the arc length of the sector and the sector area are obtained
- 17. The sector area is equal to half of the product of the sector arc length and the sector radius. Let s be the sector area, l be the sector arc length and R be the sector radius=______ ．
- 18. It is known that the area of a sector and the arc length of a sector are related to the radius. Let s be the area of a sector, l be the arc length of a sector and R be the radius of a sector, then s = ()
- 19. Given radius 1, arc length 3.2, the center angle α of the arc is equal to? It's best to have a process
- 20. For a circle with a radius of 6cm, the arc length of a central angle is 6.28cm. How many degrees is the central angle?