Question 12
Mensuration of Plane ShapesAn arc of length 22cm subtends an angle of θ at the centre of the circle. What is the value of θ if the radius of the circle is 15cm? (Take π = 22/7)
- A.70°
- B.84°
- C.96°
- D.156°
- E.168°
Show the answer and explanation
Answer: B (84°)
Explanation
θ/360 × 2 × 22/7 × 15 = 22, so θ = 22 × 360 × 7/(44 × 15) = 84°.