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Luas sisi segitiga 1 = 13 x 7 = 91
Luas sisi segitiga 2 = 12.5 x 10 = 125
Luas permukaan limas = 70 + 91 + 125 = 286
tinggi segitiga pada sisi lebar
Luas permukaaan
Lp = luas alas + 2( luas Δ sisi panjang ) + 2 (luasΔ sisi lebar )
= (p x l ) + 2 ( p x t ) + 2 (l x t)
= (10 x 7 ) + 2( 10 x13) + 2(7x 12,5)
= 70 + 2( 130) + 2(87,5)
= 70 + 260 + 175
= 505 cm²