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= 2 (7x + 4x)
= 2 (11x)
= 22x
22x = 66
x = 66 / 22
x = 3
panjang = 3 * 7 = 21 cm
lebar = 3 * 4 = 12 cm
luas = P * L
= 21 * 12
= 252 cm²
2(7x+4x) = 66
7x+4x = 66/2
11x = 33
x = 3
Luas = p.l
= (7x). (4x)
= (7.3) . (4.3)
= 21 . 12
= 252