Rectangle

The length of the rectangle is 12 cm greater than 3 times its width. What dimensions and area this rectangle has if ts circumference is 104 cm.

Result

a =  42
b =  10
S =  420 cm2

Solution:

2(a+b)=104
a = 12+3b

2a+2b = 104
a-3b = 12

a = 42
b = 10

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