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(3a+2a) * 6 di bagi 2
5a * 6
30a di bagi 2 =15a
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15a = 60 cm^2
a=4 cm
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Pembuktian
3*4 + 2*4 =12 dan 8 cm .........
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(12+8)* 6 / di bagi 2
20 * 6 di bagi 2
120 di bagi 2
= 60 cm^2(Benar)
60= 2a + 3a x 6 : 2
20= 5a
20:5= a
4 = a