Jawabanmu

2014-05-21T15:51:39+07:00
9. 135 =  \frac{1}{2} . 18 . t \\ t =  135 : 9  \\ t = 15 cm
10. L =  \frac{1}{2} . a. t = \frac{1}{2}. (10+6).8 = 16.4=64  cm^{2}
11.(maaf, soal kurang jelas)
12.K = 2(p+l) \\  36 = 2(3x+4+2x+4)   \\     \frac{36}{2} =  5x +8  \\ 18-8 = 5x \\   x =\frac{10}{5} =2
13. 10 X 8 - 4 X 6 = 80 - 24 = 56 cm2
 

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