One side of the rectangle is 7 cm, and the other is b cm. Set the formula for the dependence

One side of the rectangle is 7 cm, and the other is b cm. Set the formula for the dependence of the perimeter P of the rectangle on b.

Consider rectangle ABCD.

If one side AB = 7 and side BC = b, then

side CD = AB = 7 and BC = AD = b.

In our case, the perimeter of the rectangle depends on the unknown variable b, i.e. Is a function of b.

We get an idea:

P (b) = AB + BC + CD + AD = 7 + b + 7 + b = 2 * (b + 7),

P (b) = 2 * (b + 7).




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