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The 3rd one

Step-by-step explanation:

Let find angle z

Using law of sines

Plug in the numbers

Flip both equations

where z=85.4 or 94.6

Using the triangle interior sun theorem,

if z=85.4 let add up all so The first 2 are rules out angles to make sure they add up to 180.

The fourth one doesnt have 26.6 as a angle so it cant be that

Let try if z=94.6

The third one has that.

Also we reuse law of sines YZ=12.9 so it is the third one.

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°

1. 2

2. 11

3. 5

4. 6

5. 7

6. 5

7. -1

8. 1

step-by-step explanation: