Question

Is the answer i chose correct? please help me :)

Answer 1

Arc length = 8π

Explanation:

As we know that -

θ = arc length / radius (r) ...............(i)

As given in the question -

θ = 90°, arc length = 2π,

Put values in equation (i)-

90° = 2 π / r

r = 2 π / 90°

r = 2 × 180°/ 90°

r = 4

Now Circumference of circle = 2 π r

= 2π × 4

= 8π

Hence arc length of circle is 8π.