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dit: L permukaan?
Jawab: tinggi segitiga=√(10÷2)²+12²
=√5²+12²
=√25+144
=√169
=13
Jadi, L permukaan= La+( 4×luas segitiga)
= (10×10)+( 4×1/2×10×13 )
= 100+260
= 360cm²