A circualr wheel is divided into 8 equal sectors. If the area of one sector is 45 cm2, what is the radius of the wheel?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 10.7 cm.
Total area of circle = 8 × 45 = 360 cm2
Area of circle = πr2
πr2 = 360
⇒ r2 = 360/π
⇒ r2 = = 114.55 (approx)
⇒ r ≈ √114.55 ≈ 10.7 cm
Radius = 10.7 cm