sudut b = sudut c = 45°
sudut e = 90°
garis AB - garis DC = garis EB
18-10= 8
karna segitiga BCE = Sama kaki
maka garis CE = EB = 8
L = ½×(a+b)×t
= ½×(18+10)×8
=28×4
=112 cm²
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sudut b = sudut c = 45°
sudut e = 90°
garis AB - garis DC = garis EB
18-10= 8
karna segitiga BCE = Sama kaki
maka garis CE = EB = 8
L = ½×(a+b)×t
= ½×(18+10)×8
=28×4
=112 cm²