Question

What is the length of an arc subtending an angle of 70° at the centre?

Answer 1

For any angle n, length of arc is
$\frac{x}{360} \times \pi \: \times d \: \times n$
here it will be 7/18 π d

Answer 2

length of arc= theta/360×πr^2
=70/360×22/7 r^2
=220/360 r^2
=11/18r^2.