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ab/ef = dc/hg
30/20 = dc/16
20dc = 16×30
20 dc = 480
dc = 24 cm

sisi tegak DA/sisi tegak HE = DC/HG
sisi tgk DA/12 = 24/16
16 ss tgk DA = 12×24
16 " = 288
ss tgk DA = 288/16 = 18 cm

L trapesium = (a+b)/2 × t
(30+24)/2 × 18
54/2 × 18
486 cm^2