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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 =
L =
L = 9 . 3,14 = 28,26cm²
r =
k = 2
L =
L =
L = 16,5 . 21 = 346,5cm²
K =