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2^3=8
banyaknya pemetaan=8
2. 2(p+l)=keliling
2([l+5]+l)=82
2[l+5]+2l=82
4l+10=82
4l=72
l= 18 cm
p=18+5
= 33 cm
luas=p×l
= 33×18
= 594 cm^2
K = 2 ( p + l )
82 = 2 ( p + l )
p + l = 82 : 2
= 41
41 - 5 = 36
P = 36 : 2 = 18 + 5 = 23
l = 18
L = p x l
= 23 x 18
= 414 cm²