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=1/4 × 3,14 × 6cm × 6cm
=28,26cm'
b. L= 1/4 d'
= 1/4 × 22/7 × 21cm × 21cm
= 346,5cm'
yg ada tanga ptk itu pangkat2
L =
L = . 3,14 . 6²
L = . 3,14 . 36
L = 9 . 3,14 = 28,26cm²
r = = 3cm
k = 2 . d²
L = . \frac{22}{7} [/tex]. 21.21
L = . 66 . 21
L = 16,5 . 21 = 346,5cm²
K = . d = . 21 = 66cm