Soal di atas yaaaaaaa.

Soal di atas yaaaaaaa.

Jawaban:

$k = 2 times pi times r = pi times d \ \ a. : frac{3}{4} times (2 times frac{22}{7} times 14) \ = frac{3}{4} times 88 = 66 : cm \ \ b. : frac{1}{4} times ( 3.14 times 18) \ = frac{1}{4} times 56,52 = 14.13 : cm \ \ c. : frac{1}{2} times (frac{22}{7} times 21) \ = frac{1}{2} times 66 = 33 : cm \ \ d. : frac{1}{4} times (3.14 times 20) \ = frac{1}{4} times 62,8 = 15,7 : cm$