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panjng sisi blh ketupat = 68:4=17 cm
panjang 1/2 diagonal= akar (17^2 - 15^2) =
=akar (289 - 225) = akar 64 = 8
panjang diagonal (d2)= 2 x 8=16
luas = 1/2 x d1 x d2= 1/2 x 30 x 16 =240