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AB=BF=10
BF=CE=CD sin 90= 10
AD= AB+BC+CD=10+10+10=30
A= (jml sisi srjajar ) x t x0,5
A= (30+10) x 10 x 0,5
A= 40 x 10 x 0,5
A= 400÷ 2
A= 200 cm² (C)