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akar pangkat DE=144=> DE=akar 144= 12
keliling ABCD=AD+DC+CB+BE+AE=13+(BE-AE)+12+20+5=50+(20-5)=50+15=65
luas ABCD= (DC+AB)xDE/2=(15+(AE+BE)x12/2=(15+5+20)x6=40x6=240cmpangkat2
sudutB=sudut A=78derajat
sudutC=180-(78+90)=180-168=12derajat
sudutD=sudutC=12derajat
ini berlaku kalau itu trapesium sama kaki ya