Respuesta :

Step-by-step explanation:

Well you got a good start.  #16 = 105°, #17 = 27°, and #15 = 48°.

Inscribed angles are half the arc angle, so #3 = #10 = 21°, and #4 = #5 = 39°.

That means #14 = #12 = 120°, and #11 = #13 = 60°.

The sum of the angle arcs is 360°, and AD is the diameter, so it splits it in half.  So arc BC is 180 - 78 - 42 = 60°, so #1 = 30°.

Therefore, #2 = 90°.

AG and FG are both radii, so AGF is an isosceles triangle.  Therefore, #8 = #9 = 66°.

Similarly, FG and DG are both radii, so FGD is an isosceles triangle.  So #6 = #7 = 24°.

That means #18 = 129°.  So #20 = 129° and #19 = #21 = 51°.

That's all of them.