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20 x 4 = 800
10 x 4 = 400
1200+800+400=2400
4(P + L + T) = Jumlah Panjang Kerangka balok
=4( 30cm + 20cm+ 10cm)
= 4(60cm)
= 240 cm
sisa batang = 2,5 m - 240cm
= 250cm -240cm
= 10 cm