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60 cm = 4×s
s = 15 cm
d1 = 18 cm
d1 : 2 = 9 cm
pakai phytagoras
15² = 9² + x²
x² = 144
x = 12 cm
d2 = 2x
= 2.12
= 24 cm
L = 1/2 × d1 × d2
= 1/2 × 18cm × 24 cm
= 216 cm²
(b)