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Verified answer
Misalpanjang = x
lebar = x - 10
a) K = 2 × ( p + l )
76 = 2 × ( x + x - 10)
76 ÷ 2 = 2x - 10
38 = 2x - 10
38 + 10 = 2x
48 = 2x
x = 24
b) p = x = 24 dm
l = x - 10 = 24 - 10 = 14 dm
c) L = p × l
= 24 × 14
= 336 dm²