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1/2 d1 d2 = 35
1/2 (10) (x + 4) = 35
5(x + 4) = 35
x + 4 = 35/5
x + 4 = 7
x = 7 - 4
x = 3
panjang diagonal 2 = x + 4
= 3 + 4
= 7 cm
35 = 10 x (x + 4) / 2
70 = 10x + 40
30 = 10x
x = 3
b. x + 4 = 3 + 4 = 7
Pembuktian
L = d1 x d2 / 2
= 10 x 7 / 2
= 70 / 2 = 35