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s = √144
s = 12
tinggi sisi tegak
a = 1/2 x 12
= 6
t = 8
Lp = luas alas + 4 luas segitiga
= 12 x 12 + 4 (6x10)
= 144 + 4 (60)
= 144 + 240
= 384cm²
jawabnnya adalah 384cm²