Limas TABCD dengan alas persegi panjang ABCD, AB=18cm dan BC=10cm. Jika volume limas 720 ,maka luas permukaan limas adalah...
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720 = 1/3 . 18 . 10 . t
720 = 60t
12 = t
La = p.l
La = 18 . 10
La = 180 cm²
Ls1 = a t /2
Ls1 = 10 . 13 /2
Ls1 = 65 cm²
Ls2 = a . t /2
Ls2 = 18 . 15 /2
Ls2 = 135 cm²
Lp = La + Ls
Lp = 180 + 2 . Ls1 + 2 . Ls2
Lp = 180 + 2.65 + 2. 135
Lp = 180 + 130 + 270
Lp = 580 cm²