What is the answer

Question

A circle has a radius of 5 feet what is the circumference of a bigger circle of the scale factor of the smaller to bigger is 2:5

Answer 1

If the scale factor is 2.5 then multiply the radius by 2.5. That means the radius of the bigger circle is 5 * 2.5 or 12.5

To find the circumference, use the circumference formula C = 2πr and plug in the radius to get C = 2*π*12.5 = 78.54 (rounded to two decimal places)