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Verified answer
Luas kertas = 30 x 1/4 x π x d²= 30 x 1/4 x 22/7 x 7²
= 1.155 cm²
Verified answer
L30 × π r^2
30 × 22/7 × 3,5 × 3,5
30 × 38,5
1.155 cm2