Question

Help me please! i’m unsure of the formula and how to solve

Answer 1

12.4 cm

Explanation:

arc AB is calculated using

arc = circumference × fraction of circle

= 2πr ×
`(90)/(360)`

= 2π × 7.9 ×
`(1)/(4)`

=
`(7.9\pi )/(2)` ≈ 12.4 cm ( to the nearest tenth )