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Lp balok=2(p.l + p.t + l.t)
1650 = 2 (25p + 20p + 500)
1650 = 50p + 40p + 1000
1650 - 1000 = 50p + 40p
650 = 90p
p. = 650/90
p. = 7,2 cm
t = 20
Lp = 2 ( pl + pt + lt )
1650 = 2 ( p.25 + p.20 + 25.20 )
1650 = 2 ( 25p + 20p + 500 )
1650 = 2 ( 45p + 500 )
1650 = 90p + 1000
1650 - 1000 = 90p
p = 650/90
p = 7,2
Panjang balok = 7,2 cm