The circumference of the two circles is 198 cm and 352 cm respectively. What is the difference between their radii?
Answer & explanation
Correct answer: option 4
We know that,
Circumference of the circle = 2πr
The circumference of the two circles = 198 cm and 352 cm
According to the question,
2πr2 - 2πr1 = 352 - 198
= 2π(r2 - r1) = 154
= π(r2 - r1) = 77
= (r2 - r1) = 77 × \(\frac{7}{22}\)
= (r2 - r1) = 24.5