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ukuran balok = p x 2 x 1
Lp = 100 cm²
maka :
Lp = 2 x (px2 + px1 + 2x1)
100 = 2 x (2p + p + 2)
100 = 2 x (3p +2)
100 = 6p + 4
6p = 100-4
p = 96/6
p = 16 cm
a. jadi nilai p = 16 cm
b. Jumlh pnjng rusuk = 4 x (16+2+1)
= 4 x 19
= 76 cm
100 = 2.(p.2+p.1+ 2.1)
100:2 = 2p+p+2
50 = 3p+2
50-2 = 3p
48 = 3p
p = 48/3
p = 16
b) p = 16 , l = 2 , t = 1
jadi,
jmlh p.rusuk = 4.(p+l+t)
= 4.(16+2+1)
= 4.19
= 76 cm