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t.limas = 12
dit : L.s.s.t.limas
jawab :
panjang sisi miring segitiga = √ 9² + 12²
= √ 81+144
= √225
= 15 cm
luas seluruh sisi tegak limas = 4× 1/2× a×t
= 4×1/2×18×15
= 540 cm²