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40 : 4 = sisi
10 = sisi
tinggi sisi miring Δ ?
= 5² + 12²
= 25 + 144
= 169
= 13
maka luas permukaan
luas alas + 4 luas sisi tegak
( 10x10)+(10x13)
= 100 + 130
= 230