Jawabanmu

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2014-05-22T19:22:48+07:00
Panjang kawat 
= 4( p+l+t )
= 4( 8 + 6 + 7 )
= 4 ( 21 ) = 84 
l. permukaan balok 
= 2 ( pl + pt + lt )
= 2 ( 8.6 + 8. 7 + 6 . 7 )
= 2 ( 48 + 56 + 42 )
= 2 ( 146 ) = 292 
1 5 1
2014-05-22T19:27:28+07:00
2 (pl, pt, lt )
(8,7 8,6 6,7)
(48,56,42)
= 2(142)
=292