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( a ) K = 2 ( p + l )
= 2 ( 12 + 8 )
= 2×20 = 40
L = p×l
=12×8 = 96
( b ) K = 2 ( p + l )
= 2 ( 23 + 14 )
= 2×37 = 74
L = p×l
= 23×14
= 322