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1/2 d2 = √13-12
= √169-144
= √25
= 5 cm
d2 = 10 cm
= 1/2 d1 d2
= 1/2 * 24 * 10
= 12 * 10
= 120 cm²
luas jajar genjang = a * t
= 15 * 9
= 135 cm²
luas keduanya yang tidak diarsir = (120 - 78) + (135 - 78)
= 42 + 57
= 99 cm²