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= 15
tinggi sisi tegak
Lp = luas alas + 4 (luas segitiga tegak )
= s x s + 4 ( a x t)
= 30 x 30 + 4 ( 15 x 25 )
= 900 + 4 ( 375)
= 900 + 1500
= 2400 cm²