Keliling balok = 4 ( p+l+t )
= 4 (20cm +15cm+8cm)
= 4 . 43cm
= 172cm
=>172cm x 2 kerangka = 344cm
= 3,44m (b)
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Keliling balok = 4 ( p+l+t )
= 4 (20cm +15cm+8cm)
= 4 . 43cm
= 172cm
=>172cm x 2 kerangka = 344cm
= 3,44m (b)