In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. The length of the arc is;
A. 20cm
B. 21cm
C. 22cm
D. 25cm
Answer:C
In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. The length of the arc is;
A. 20cm B. 21cm C. 22cm D. 25cm
Explanation: Length of an arc = (θ/360°) × (2πr)