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= 14
alas segitiga
a = 1/2 x 14
= 7
tinggi sesi tegak
luas segitiga
LΔ = 7 x 7√5
= 49√5
Lp = La + 4 x LΔ
= 14 X 14 + 4 X 49√5
= 196 + 196 √5