# right angle   125 videos

• #### Supplementary and Complementary Angles

##### GeometryGeometry Building Blocks

How to identify supplementary and complementary angles.

angles sum right angle
• #### Angles: Types and Labeling

##### GeometryGeometry Building Blocks

How to label an angle and how to differentiate between acute, right, obtuse, and straight angles.

angle acute right obtuse straight vertex side
• #### Similar Triangles in Circles and Right Triangles

##### GeometrySimilarity

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.

similar inscribed angles intercepted arc right angle circle
• #### Right hand Rule

##### PhysicsMagnetism

How to use the right hand rule to predict forces in magnetic fields.

right hand rule magnetic field
• #### Angle of Elevation and Depression

##### GeometryBasic Trigonometry

How to define an angle of elevation or an angle of depression.

trigonometry angle of elevation angle of depression
• #### Angle of Elevation and Depression

##### TrigonometryBasic Trigonometry

How to define an angle of elevation or an angle of depression.

trigonometry angle of elevation angle of depression
• #### Angle of Elevation and Depression

##### PrecalculusBasic Trigonometry

How to define an angle of elevation or an angle of depression.

trigonometry angle of elevation angle of depression
• #### Radian Measure of Angles

##### TrigonometryTrigonometric Functions

How to measure angles using degrees or radians.

angle degree measure acute angle right angle obtuse angle radian measure
• #### Radian Measure of Angles

##### PrecalculusTrigonometric Functions

How to measure angles using degrees or radians.

angle degree measure acute angle right angle obtuse angle radian measure
• #### Angles in Semicircles and Chords to Tangents

##### GeometryCircles

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.

inscribed angle semicircle tangent chord intercepted arc
• #### Inscribed Angles

##### GeometryCircles

How to calculate the measure of an inscribed angle.

inscribed angle intercepted arc central angle congruent arcs
• #### Remote Interior Angles

##### GeometryTriangles

How to define exterior angles and their remote interior angles and how to prove their properties.

exterior angle remote interior angle non adjacent angle
• #### Angles

##### Pre-AlgebraIntroductory Geometry

Vocabulary of angles and how to measure an angle with a protractor

• #### Corresponding Angles

##### GeometryReasoning, Diagonals, Angles and Parallel Lines

How to define corresponding angles and their special properties.

parallel lines angles congruence
• #### Angle Bisectors

##### GeometryGeometry Building Blocks

How to label an angle bisector; how to use an angle bisector to find a missing variable.

congruent angles ray
• #### Duplicating an Angle

##### GeometryConstructions

How to duplicate an angle using a compass and straightedge.

congruent angles construction compass straightedge
• #### Exterior Angles of a Polygon

##### GeometryPolygons

How to find the sum of the exterior angles in a polygon and find the measure of one exterior angle in an equiangular polygon.

exterior angle sum of angles equiangular polygon
• #### Angle Inclination of a Line

How to find the angle of inclination of a line.

angle inclination horizontal lines tangent slope