ABC26GN4621 · Area

Subject: General Aptitude · Chapter: Area · Exam: · Marks: · Difficulty:

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

Answer (as printed): D

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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