• #### Inscribed Angles - Concept

##### Math›Geometry›Circles
How to calculate the measure of an inscribed angle.
• #### Inscribed Angles - Problem 1

##### Math›Geometry›Circles
How to find the measure of an inscribed angle and a missing arc.
• #### Inscribed Angles - Problem 3

##### Math›Geometry›Circles
How to find the measure of inscribed angles that have congruent intercepted arcs.
• #### Inscribed Angles - Problem 2

##### Math›Geometry›Circles
How to find the measure of intercepted arcs, given the vertex angle of an inscribed isosceles triangle.
• #### Angles in Semicircles and Chords to Tangents - Problem 1

##### Math›Geometry›Circles
How to find the missing angles in an angle inscribed in a semicircle.
• #### Angles in Semicircles and Chords to Tangents - Concept

##### Math›Geometry›Circles
How to prove that an angle inscribed in a semicircle is a right angle; how to solve for arcs and angles formed by a chord drawn to a point of tangency.
• #### Angles in Semicircles and Chords to Tangents - Problem 3

##### Math›Geometry›Circles
How to solve for arcs and angles formed by two chords drawn to a point of tangency.
• #### Angles in Semicircles and Chords to Tangents - Problem 2

##### Math›Geometry›Circles
How to solve for arcs and angles formed by a chord drawn to a point of tangency.
• #### Central Angles and Intercepted Arcs - Problem 4

##### Math›Geometry›Circles
How to find the measure of an arc created by the vertices of an inscribed regular polygon.
• #### Cyclic Quadrilaterals and Parallel Lines in Circles - Problem 1

##### Math›Geometry›Circles
How to calculate angles in a cyclic quadrilateral given arc measures and two angle measures.
• #### Similar Triangles in Circles and Right Triangles - Problem 2

##### Math›Geometry›Similarity
How to find missing side lengths in a right triangle with an altitude drawn from the right angle.
• #### Cyclic Quadrilaterals and Parallel Lines in Circles - Concept

##### Math›Geometry›Circles
How to prove that opposite angles in a cyclic quadrilateral are congruent; how to prove that parallel lines create congruent arcs in a circle.
• #### Constructing the Incenter - Problem 1

##### Math›Geometry›Constructions
How to construct the inscribed circle of a triangle using a compass and straightedge.
• #### Similar Triangles in Circles and Right Triangles - Problem 1

##### Math›Geometry›Similarity
How to find missing side lengths of triangles in a circle.
• #### Cyclic Quadrilaterals and Parallel Lines in Circles - Problem 2

##### Math›Geometry›Circles
How to calculate the measure of an arc created by a cyclic parallelogram.
• #### Similar Triangles in Circles and Right Triangles - Concept

##### Math›Geometry›Similarity
How to determine if two triangles in a circle are similar and how to prove that three similar triangles exist in a right triangle with an altitude.
• #### Arc Length - Problem 3

##### Math›Geometry›Circles
How to find the arc length formed by an inscribed angle given the diameter.
• #### Tangent Segments to a Circle - Problem 2

##### Math›Geometry›Circles
How to find the measure of an angle formed by a chord drawn between two points of tangency.