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Who knows how to calculate the perimeter and area of a semicircle
The circumference of a semicircle is equal to half the circumference of the circle + the length of the diameter
The area of a semicircle is equal to half the area of a circle
The circumference of a semicircle is equal to half the circumference of a circle plus a diameter
The teacher is right. I don't think it's right, because the radius is different. Who has a better reason?
Yes, the circumference of the semicircle is equal to half of the circumference of the circle, plus a diameter. The length of the semicircle arc is equal to half of the circumference of the circle
RELATED INFORMATIONS
- 1. In the figure below, the circumference of big circle and small circle are 31.4cm and 25.12cm respectively
- 2. Fill in the blanks: the circumference of a semicircle is 25.7cm, and its area is () square centimeter
- 3. 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
- 4. The area of the semicircle is 14.13 square centimeters. Find the circumference of the semicircle
- 5. The circumference of a semicircle is 10.28 cm. What's its radius?
- 6. We know that the circumference of a circle is 28.26 cm. What is its radius and diameter
- 7. The circumference of a semicircle is 20.56 cm. What is its diameter? Fast, time is short
- 8. The circumference of a semicircle is 30.28 cm. What is its area Hurry, hurry, hurry, hurry, hurry, hurry!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
- 9. The circumference of a semicircle is 15.42 cm. What is the area of the semicircle?
- 10. The radius of a circle is 2.4 cm, the circumference of the circle is () cm, and the area is () square cm
- 11. 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?
- 12. The circumference of a semicircle is 25.7 cm. How many square centimeters is its area?
- 13. 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;
- 14. 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?
- 15. 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?
- 16. Find the difference between the perimeter and area of two circles r = 4cm and d = 18cm
- 17. The circumference of a circle is 2 μ R, and the circumference of a semicircle is?
- 18. 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
- 19. 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?
- 20. Given the circumference of the semicircle, the formula of area