circumfrence and area of a circle, radius 7m

Question

Find the circumfrence and area of each circle to the nearest tenth. Use 3.14

16. r=7m

17. d=18in.

18. d-24ft

19. r=6.4cm

Answer 1

circumference = Pi * d = Pi * 2 * r

area = Pi * (d/2)^2 = Pi * r^2

16)

circumference = 3.14 * 2 * 7 = 43.96

area = 3.14 * 7^2 = 153.86

17)

circumference = 3.14 * 18 = 56.52

area = 3.14 * (18/2)^2 = 254.34

18)

circumference = 3.14 * 24 = 75.36

area = 3.14 * (24/2)^2 = 452.16

19)

circumference = 2 * 3.14 * 6.4 = 40.192

area = 3.14 * 6.4^2 = 128.6144