Rectangle

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

Correct answer:

a =  42 cm
b =  10 cm
S =  420 cm2

Step-by-step explanation:

o=104 cm  2(a+b)=o a=12+3b 2(a+b)=104 a=12+3b  2 (a+b)=104 a=12+3 b  2a+2b=104 a3b=12  Row221 Row1Row2 2a+2b=104 4b=40  b=440=10 a=21042b=21042 10=42  a=42 b=10
S=a b=42 10=420 cm2



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