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240 = 1/2 . 30 . d2
8 = 1/2 . d2
16 cm = d2
s² = (1/2 . 30)² + (1/2 . 16)²
= 15² + 8²
= 225 + 64
s² = 289
s = 17
L = 240 cm²
d1 = 30 cm
Dijawab :
L = 1/2 . d1 . d2
240 = 1/2 . 30 . d2
240 = 15 . d2
d2 = 240/15
d2 = 16
Maka,
s = √(1/2 . 30)² +(1/2 . 16)²
= √15² +8²
= √289
= 17 cm
Jadi, sisi belah ketupat tersebut adalah 17 cm.