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Keliling = 2p + 2l
120 = 2p + 2(20)
120 = 2p + 40
120 - 40= 2p
= p
40 m=p
Luas = p × l = 40 × 20 = 800 m²
Semoga bermanfaat :D
120= 2p + 2.20
120= 2p+40
2p= 120-40
2p= 80
p= 80/2
p= 40
L= p x l
L= 40 x 20
L= 800 m²