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d2 = 169-144 = akar25
luas = (d1+d2)/2
= (10.24)/2=120 cm^2
s=13
dalam kasus ini kita menggunakan rumus phytagoras
D1 di bagi 2 = 12
B=√13²-12²= 169-144= √25=5
Rumus = D1 x D2 : 2
= 24 x (5x2) :2
=24 x 5
=120 cm²