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LA = 122 cm
panjang = 14 cm
t = 5 cm
maka :
LA = p x l
122 = 14 x l
l = 122 / 14 = 8,71
maka :
Lp = 2 x (pxl) + (pxt) + (lxt)
= 2 x [(14x8,71)+(14x5)+(8,71x5)]
= 2 x [121,94 + 70 + 43,55]
= 470,9
= 471 cm²
p = 14 cm
t = 5 cm
Luas permukaan = ...?
dicari lebar dulu
L = p.l
122 = 14. l
l = 122 ÷ 14
Luas permukaan = 2 ( pl + pt + lt )
Lp = 2 ( 122 + 14×5 + 122/14 × 5 )
Lp = 2 ( 192 + 305/7 )
Lp 384 + 87, 14286
Lp = 471, 14286...