If in a circle of radius 21 cm, an arc subtends an angle of 56° at the centre, the length of the arc is · ABC26GN4621
Subject: General Aptitude · Chapter: Area
If in a circle of radius 21 cm, an arc subtends an angle of 56° at the centre, the length of the arc is
(a)15.53 cm
(b)16.53 cm
(c)18.53 cm
(d)20.53 cm
Answer
Explanation
Length of the arc $$=\frac{2 \pi r \theta}{360}=\left(2 \times \frac{22}{7} \times 21 \times \frac{56}{360}\right) \mathrm{cm}=\left(\frac{308}{15}\right) \mathrm{cm}=20.53 \mathrm{cm} .$$
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