Question

What would the formulas be for these three questions?



I lost my notes :/

Sorry! For the first one I have to find arc AFB. For the second I have to find y and for the third I have find z.

(diagrams in the comments)

Answer 1

for the middle picture, the central angle is the average of the two arcs
(50= (70+30)/2 )
for the last picture, use this to find the central angle, and then 180-central angle gives the answer
(40+z)/2 = 180-124 if I read that correctly

Answer 2

Awesome! Thank you so much!

Answer 3

I think in the first picture, angle D is the difference of the two arcs divided by 2
D= (arc AC - arc BC) /2

Answer 4

Okay. That would make sense