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2(p + l) = 80
(p + l) = 40
(l + l +10) = 40
2l + 10 = 40
2l = 30; l = 15;
p + l = 40
p + 15 = 40
p = 25;
Luas = p * l
Luas = 25 * 15 = 375
keliling= 2(p+l)
80= 2(10 + l + l)
80= 2(10 + 2l)
80= 20 + 4l
80 - 20= 4l
4l= 80 - 20
4l= 60
l= 60/4
l= 15
a) p= 10 + l
p= 10 + 15
p= 25 cm
l= 15 cm
Jadi, p= 25 cm, dan l= 15 cm
b) luas persegi panjang :
p × l
25 × 15
375
Jadi, luas persegi panjang tersebut adalah 375 cm².