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tinggi sisi tegak limas(segitiga)=√12^2+5^2
=√144+25=√169=13
l permukaan limas=luas alas+jmlah luas sisi tegak
=s×s+4×a×t÷2
=10×10+4×10×13÷2
=100+520÷2=100+260=360
jawabanya B.