The circumference of the two circles is 264 cm and 396 cm respectively. What is the difference between their radii?
Answer & explanation
Correct answer: option 4
Formula Used
Circumference = 2\(\Pi \)r
Difference in radius, r2 - r1 = C2/2\(\Pi \) - C!/2\(\Pi \)
Calculation
r2 - r1 = 1/2\(\Pi \) (C2 - C1)
= 1/2\(\Pi \) (396 - 264) cm
= (0.159 x 132) cm
= 20.99 cm
= 21 cm
Therefore, difference between the radii of two circles is 21 cm.