Question

Please help with 20 through 25

Answer 1

Easiest way to find the arc is
2 * pi * r * ( the central angle (CA)/ 360)
20.pi* 2* r * central angle/ 360 = AB
2*r=24 CA/360=90/360=.25
pi*24*.25=pi * 6

So you should be able to use that formula on the rest :)