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trapesium ABCD ~ AEFG
sehingga :
AB ~ ae
BC ~ ef
DC ~ gf
AD ~ ag
dalam perbandingan senilai :
jika a : b = A : B
maka a = A/B x b
A = a/b x B
b = B/A x a
B = b/a x A
sehingga :
DC = gf/ag x AD ---> AG = AD - GD
= 14/7,5 x 12 = 12 - 4,5
= 22,4 = 7,5
BC = ef/gf x CD
= 8/14 X 22,4
= 12,8