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5. luas = a. t
126 = a. 14
a = 9 cm
6. luas = d1 x d2 / 2 = 12 x 8/2 = 48 cm2
7. luas = d1 x d2/2
480 = 40.d2/2
d2 = 480/20
d2 = 24 cm
8. lluas = (16+8)x8/2 = 24x4 = 96 cm2
9. d
10. L = a.t/2 = 14.12/2 = 84 cm2
11. <BCD = 180 - 70 = 110
12. 3x + 2x + x = 180
6x = 180
x = 30
7-10 c d a b
11-14 c a b c