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Jendela p=18dm t=15dm
Luas = 68*35 = 2380 dm
luas jendela = 18*15 =270 * 2 (karena ada 2) = 540
Luas dinding tanpa jendela 2380dm-540dm=1840dm
6.L trapesium = jss/2*t
=(4+3)/2 *0.9
=7/2*0.9= 3.5*0.9= 3.15m
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