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62 = 2 ( 5 + l + l )
31 = 5 + 2l
2l = 31 - 5
2l = 26
l = 13 cm
L = p × l
= ( 5 + 13 ) cm × 13 cm
= 234 cm²
p = 5 + l
K = 62 m
maka :
K = 2 x (p+l)
62 = 2 x (5 + l+ l)
62 = 2 x (5+2l)
62 = 10 + 4l
4l = 62-10
l = 52/4
l = 13
panjang = 5 + 13 = 18
jdi :
L = p x l
= 18 x 13
= 234 cm²