Question

Here is a circle and a scaled copy of the circle with a scale factor of `2`.

How does the circumference of the scaled copy compare to the circumference of the original circle?

Answer 1

• So we know that C= 2×pi×r
• Say the r of the first circle is 1 then C= 2pi
• Now its dilated by a scale factor of 2 so the r=2, so the C=4pi
• We notice the circumference doubles.