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2(PL+PT+LT ) = LP
2(3a.2a+3a.a+2a.a) = 550
6a² +3a²+2a² = 275
11a² =275
a² = 25
a=5
P=3a=15
L=2a=10
t=a = 5
.... C....
= 2(3x.2x) + 2(2x.1x) + 2(3x.1x)
= 12x² + 4x² + 6x²
= 22x²
22x² = 550
x² = 550 / 22
x² = 25
x = 5
P = 3 * 5 = 15
L = 2 * 5 = 10
T = 1 * 5 = 5