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480 = 6x . 5x
480 =30x²
x²=16
x=4
p= 24
l= 20
l=16
Lp= 2 (pl+pt+lt)
= 2 (24.20 +24.16 + 20.16)
= 2 (480 + 384 + 320)
=2 (1184)
=2368