Rectangle - perimeter, side

From the formula for calculating the perimeter of a rectangle, express the length of side b and find its size for o = 28 cm, a = 7.5 cm.

Correct answer:

b =  6.5 cm

Step-by-step explanation:

o=28 cm a=7.5 cm  o = 2(a+b) o/2 = a+b  b=o/2a=28/27.5=6.5 cm



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