Question

Please help!! I have no clue how to do this

Answer 1

Answer:

Step-by-step explanation:

you need the arc length formula .. do you have it?

s = r ∅

s  is the arc length in radians but you can make it in degrees just by

using    s = 2πr (θ/360)

the angle is 180 for the picture.

so the arc length is just  $\pi$r

r= 4

$\pi$*4 = 12.56637.... approx

Answer 2

Answer:

s  is the arc length in radians but you can make it in degrees just by

using    s = 2πr (θ/360)

angles 180 for the picture.

arc length is just  r

r= 4

4 = 12.5

Step-by-step explanation: