Question

In circle Y, what is m∠SZT?

86°
94°
108°
128°

Answer 1

I don't have the diagram or any given arc/angle measures, so I can't choose the correct option yet. Can you either

- upload the picture of circle Y, or
- describe which arcs or angles are given (for example: arc ST = __°, arc ST = minor/major, angle at Y = __°, a tangent at S makes __° with chord ST, etc.)?

Helpful formulas so you can check quickly:
- Inscribed angle = 1/2(measure of intercepted arc).
- Central angle = measure of intercepted arc.
- Angle formed by two chords that intersect inside the circle = 1/2(sum of intercepted arcs).
- Angle formed by two secants/tangents that intersect outside = 1/2(difference of intercepted arcs).
- Angle formed by a tangent and a chord = 1/2(measure of intercepted arc).

If you send the diagram or the relevant arc measures I’ll compute m∠SZT and pick the correct choice.