Question

If the radius (r) of a circle is increased by ‘x’ units, what is the number of units by which the circumference of the circle is increased?

• A. π
• B. 2π
• C. 2πr
• D. 2πx

Answer 1

Answer:

D. 2πx

Let the radius of the circle be r cm Circumference of the circle = 2πr New radius of the circle = (r + x) New circumference of the circle = 2π (r + x) = 2πr + 2πx Circum increased by = 2πr + 2πx – 2πr = 2πx