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L = 2( pl + pt+lt)
630 = 2(15x + 15.5 + 5x)
630/2 = 20x + 75
315 -75 = 20x
240 = 20x
x= 240/20 = 12
V= p.l.t
v= 15.12.5
v=900
2. panjang kawat:
= 12 . rusuk
=12. 30
=360 cm
315 = 20l + 75
240 = 20l
l = 240/ 20
l = 12 cm
b). V = 15 x 12 x 5
= 900 cm3