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no 5

K = 2p + 2l

= 2p + 2×10

52 = 2p + 20

2p = 52-20 = 32

p = 32/2 = 16

no 6

K = 2p+2l

72 = 2×21 + 2l

= 42 + 2l

2l = 72-42 = 30

l = 30/2 = 15

no 7

K = 2p+2l

40 = 2p + 2×8

40 = 2p + 16

2p = 40-16 = 24

p = 24/2 = 12

L = p x l

= 12 x 8 = 96

no 8

L = p x l

90 = p x 9

p = 90/9 = 10

K = 2p+2l

= 2×10 + 2×9

= 20 + 18 = 38