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2 Luas alas + Keliling alasx T = 228
2 x 9 x4 + 26T = 228
72 + 26T = 228
26T = 228-72
26T = 156
T =156/26 = 6cm
Luas permukaan = 228
panjang = 9
lebar = 4
Ditanyakan : Tinggi = ....?
Jawab :
Luas perm = 2 (p.l+p.t+l.t)
228 = 2(9.4+9t+4t)
228 = 2 (36+13t)
228 = 72 + 26t
26t = 228 - 72
26t = 156
t = 156 / 26 = 6 cm
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