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p = 10 + l
keliling = 2p + 2l
(=) 2(10+l) + 2l
(=) 20 + 2l + 2l
(=) 4l + 20
4l + 20 = 100
4l = 100 - 20
4l = 80
l = 80 / 4
l = 20 cm
l = 20 cm
p = 10 + 20 = 30 cm
luas = pl
= 20*30
= 600 cm²
lebar = x
=2(x + 10) + 2x
= 2x + 20 + 2x = 100
= 2x + 2x = 100-20
= 4x = 80
x = 20
lebar= x cm = 20 cm
panjang = x + 10 = 20 + 10 = 30 cm
b. luas persegi panjang = p * l = 20 cm * 30 cm = 600 cm2