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L belah ketupat = d1 x d2 / 2
240 = 16 x d2 / 2
240 / 8 = d2
30 = d2
d2 = 30.
triple phitagoras = 8, 15, 17.
8 dari 16/2
15 dari 30/2
17 itu phitagoras/sisi miring.
Keliling belah ketupat = sisi miring x 4
17 x 4 = 68 cm.
D1 = 16 cm
dit : Kbelah ketupat =...?
L = D1 x D2 / 2
240 = 16 x D2 / 2
240 = 8D2
D2 = 30
x = √15²+8²
x = √225+64
= √289
x = 17 cm
Keliling Belah ketupat = 4s
= 4x
= 4(17)
= 68
jadi, keliling belah ketupat tersebut adalah 68 cm