Circles- Angles inside and outside

Front

What is the formula to find an angle inside a circle?

Back

(1/2)(arc + arc)

Front

What is the formula to find an angle outside a circle?

Back

(1/2)(arc - arc)

Front

What is the measure of angle DEF if it is given as 72 degrees?

Back

72 degrees

Front

If arc AB measures 68 degrees, what is the measure of angle formed by the arcs?

Back

68 degrees

Front

What is the relationship between the angles formed by two intersecting chords inside a circle?

Back

The angle is equal to half the sum of the measures of the arcs intercepted by the angle and its vertical angle.

Front

How do you calculate the measure of an angle formed by two tangents outside a circle?

Back

The angle is equal to half the difference of the measures of the intercepted arcs.

Front

What is the measure of an angle formed by a tangent and a chord?

Back

The angle is equal to half the measure of the intercepted arc.

Front

If two arcs measure 40 degrees and 60 degrees, what is the angle formed inside the circle?

Back

(1/2)(40 + 60) = 50 degrees

Front

If two arcs measure 100 degrees and 80 degrees, what is the angle formed outside the circle?

Back

(1/2)(100 - 80) = 10 degrees

Front

What is the measure of a central angle in relation to its intercepted arc?

Back

The measure of a central angle is equal to the measure of its intercepted arc.