# Is an inscribed angle equal to its intercepted arc?

## Is an inscribed angle equal to its intercepted arc?

The Inscribed Angle Theorem states that the measure of an inscribed angle is half the measure of its intercepted arc. Inscribed angles that intercept the same arc are congruent.

## How do you prove the inscribed angle theorem?

You can probably prove this by slicing the circle in half through the center of the circle and the vertex of the inscribed angle then use Thales’ Theorem to reach case A again (kind of a modified version of case B actually).

**What is the formula for intercepted arc?**

Since the inscribed angle has a degree measure, the intercepted arc also has a degree measure. The intercepted arc is twice the size of the inscribed angle. For instance, if we had a 50 degree inscribed angle, the intercepted arc would have a measure of 100 degrees, 50 degrees * 2 = 100 degrees.

**What is the relationship between inscribed angle and intercepted arc?**

Inscribed angles are angles whose vertices are on a circle and that intersect an arc on the circle. The measure of an inscribed angle is half of the measure of the intercepted arc and half the measure of the central angle intersecting the same arc. Inscribed angles that intercept the same arc are congruent.

### When an inscribed angle intercepts the same arc as a central angle the inscribed angle has half the measure of the central angle?

The measure of an inscribed angle is half the measure of the intercepted arc. That is, m∠ABC=12m∠AOC. This leads to the corollary that in a circle any two inscribed angles with the same intercepted arcs are congruent.

### Which angles intercept the same arc?

**What does the inscribed angle theorem tell us?**

The inscribed angle theorem states that an angle θ inscribed in a circle is half of the central angle 2θ that subtends the same arc on the circle.

**Which is an inscribed angle?**

Inscribed angles are angles whose vertices are on a circle and that intersect an arc on the circle. The measure of an inscribed angle is half of the measure of the intercepted arc and half the measure of the central angle intersecting the same arc.

## What is the measure of an inscribed angle with an arc measurement of 120 degrees?

60 degrees

The inscribed angles create three intercepted arcs. We can determine the measurement of the arcs by dividing 360 (the measure of the circle) by 3 (the number of arcs). Each arc measures 120 degrees. Therefore, the inscribed angle associated with it is 1/2 of 120 degrees or 60 degrees.

## Can an inscribed angle and central angle intercept the same arc?

We began the proof by establishing three cases. Together, these cases accounted for all possible situations where an inscribed angle and a central angle intercept the same arc. In Case A, we spotted an isosceles triangle and a straight angle.

**What is the measure of the inscribed angle of the arc?**

The inscribed angle’s measure is half that of the central angle of the same arc, as we will now prove. This will be a long proof, as it needs to address several different cases – so fasten your seat belt! Show that an inscribed angle’s measure is half of that of a central angle that subtends, or forms, the same arc.

**What is an inscribed angle in geometry?**

An Inscribed angle is just… What is an Inscribed Angle? Is formed by 3 points that all lie on the circle’s circumference. The measure of the inscribed angle is half of measure of the intercepted arc . Explore this relationship in the interactive applet immediately below.

When proving the Inscribed Angle Theorem, we will need to consider 3 separate cases: The first is when one of the chords is the diameter. The second case is where the diameter is in the middle of the inscribed angle. And the third case is when the diameter is outside the inscribed angle.