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1/4 x 3,14 x 10 x 10
1/4 x 314
78,5
360
=90 × 314
360
= 78.5 cm²
Luas segitiga aob = 1/2.10.10
=50 cm²
Luas tembereng = 78.5 cm² + 50 cm² = 128.5 cm²