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= ( s × s ) - ( 1/2 × d1 ×d2 )
= ( 24cm × 24cm ) - ( 1/2 × 24cm × 24cm )
= 576cm² - ( 24cm × 12cm )
= 576cm² - 288cm²
= 288cm²
10. r = d : 2 = 20cm : 2 = 10 cm
t = r
luas yang diarsir = luas lingkaran - luas segitiga = ( π × r² ) - ( 1/2 × a × t )
= ( 3.14 × 10² ) - ( 1/2 × 20 × 10 )
= ( 3.14 × 100 ) - ( 10 × 10 )
= 314cm² - 100cm²
= 214cm²
maaf kalau salah