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Luas alas = 112 cm²
p = 14 cm
t = 5 cm
Dijawab :
Luas alas = p . l
112 = 14 . l
l = 112/14
l = 8 cm
Luas permukaan = 2(pl +pt +lt)
= 2{(14 . 8) +(14 . 5) +(8 . 5)}
= 2{112 +70 +40}
= 2(222)
= 444 cm²
Itu jawabannya.