Question

Find the length of arc ab. Need help!!!

Answer 1

12.4cm (rounded to nearest tenth)

Explanation:

To find the length of an arc, you have to find the circumference of the full circle itself multiplied by the angle of the arc over 360°. The circumference of a circle is pi × r × 2.

Length of arc =
`(90)/(360)` × 3.14 × 7.9 × 2

= 12.403

≈ 12.4cm (rounded to nearest tenth)