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45 = (5+l)+l
45 = 5+2l
40 = 2l
b.l = 20 cm
a.p= 5 + 20 = 25 cm
c.L= p x l = 25 x 20 = 500 cm
panjangnya adalah 90:18 = 5
luasnya adalah 18 x 5 =90
moga2 bener yaaa...