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Pnajng rangka balok = 120 cm
panjang = 15 cm
tinggi = 10 cm
maka :
Pnjng rangka = 4 x (p+l+t)
120 = 4 x (15+10+t)
120 = 4 x (25+t)
120 = 100 + 4t
4t = 120-100
t = 20/4
t = 5 cm
jdi tinggi balok = 5 cm
120 = 4(15+10+ t)
120=4.(25)
120:4=25
30-25=5
jawabannya 5 cm