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Verified answer
Keliling = 2 (p+l)84 = 2 (p+l)
42 = p+l
6 = p-l
_______ -
36 = 2l
18 = l
6 = p-l
6 = p-18
24 = p
luas = p×l
luas = 24×18
luas = 432 m2
Rumus keliling
2p + 2l = 84 [ dikalikan 1 ] ---> 2p + 2l = 84
p - l = 6 [ dikalikan 2 ] ---> 2p - 2l = 12
___________+
4p = 96
p = 24
p - l = 6
24 - l = 6
24 - 6 = l
18 = l
Luas Persegi Panjang = P × L
24 × 18
432 cm²