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a₁ = 1/2 x 10
= 5
tinggi
LΔ₁ = a₂ x t
= 9 x 13
= 117 cm²
tinggi sisi tegak pada alas pajang
a₂ = 1/2 x 18
= 9
tinggi
LΔ₂ = a₁ x t
= 5 x 15
= 75
luas permukaannya
Lp = La + 2 (LΔ₁ + LΔ₂)
= 18 x 10 + 2 ( 75 + 117)
= 180 + 2 ( 192)
= 180 + 384
= 564 cm²
jawabannya 564 cm²
sebelumnya kita harus mencari sisi miringnya terlebih dahulu
√9²+√12²
= √81 + √144
= √225
= 15cm
lp = p.l + 4.18.15/2
= 180 + 540
= 720 cm²