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.

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  a=42=42 cm b=10
S=a b=42 10=420 cm2

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