Jawabanmu

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2014-06-02T20:52:46+07:00
L = (jumlah sisi sejajar) x tinggi x 1/2
100 = (2x + 3x) x 8 x 1/2
100 = 5x x 4
5x = 100 : 4
5x = 25
x = 25 : 5
x = 5
PQ = 3x = 3 x 5 = 15 cm
SR = 2x = 2 x 5 = 10 cm
1 5 1
2014-06-02T20:53:25+07:00
3 x 5 = 15 (15+10) x 8 : 2 = 100
3 x 5 = 10