350 Videos for "angles"

Duplicating an Angle  Concept
Math › Geometry › Constructions
How to duplicate an angle using a compass and straightedge. 
Duplicating an Angle  Problem 1
Math › Geometry › Constructions
How to duplicate an angle using a compass and straightedge. 
Angles: Types and Labeling  Concept
Math › Geometry › Geometry Building Blocks
How to label an angle and how to differentiate between acute, right, obtuse, and straight angles. 
Triangle Angle Sum  Problem 1
Math › Geometry › Triangles
How to apply the triangle angle sum theorem when you need to find missing angles. 
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. 
Exterior Angles of a Polygon  Problem 1
Math › Geometry › Polygons
How to find the measures of the three exterior angles of a triangle in terms of a variable. 
Inscribed Angles  Problem 2
Math › Geometry › Circles
How to find the measure of intercepted arcs, given the vertex angle of an inscribed isosceles triangle. 
The DoubleAngle Formulas  Problem 1
Math › Trigonometry › Advanced Trigonometry
How to use the sine and cosine doubleangle formulas to find sin(2a) and cos(2a) when sin(a) is known. 
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. 
The DoubleAngle Formulas  Problem 2
Math › Precalculus › Advanced Trigonometry
How to derive a tripleangle formula for cosine. 
The DoubleAngle Formulas  Concept
Math › Trigonometry › Advanced Trigonometry
How to use the sine and cosine addition formulas to prove the doubleangle formulas. 
The DoubleAngle Formulas  Concept
Math › Precalculus › Advanced Trigonometry
How to use the sine and cosine addition formulas to prove the doubleangle formulas. 
The DoubleAngle Formulas  Problem 1
Math › Precalculus › Advanced Trigonometry
How to use the sine and cosine doubleangle formulas to find sin(2a) and cos(2a) when sin(a) is known. 
The DoubleAngle Formulas  Problem 2
Math › Trigonometry › Advanced Trigonometry
How to derive a tripleangle formula for cosine. 
Triangle Angle Sum  Concept
Math › Geometry › Triangles
How to apply the triangle angle sum theorem. 
Polygon Angle Sum  Concept
Math › Geometry › Polygons
How to derive the formula to find the sum of angles in any polygon. 
Radian Measure of Angles  Problem 1
Math › Trigonometry › Trigonometric Functions
How to measure a central angle of a circle when the radius and the length of the intercepted arc are given. 
Angle of Elevation and Depression  Problem 1
Math › Trigonometry › Basic Trigonometry
How to use an angle of depression to solve a word problem with an airplane. 
Triangle Angle Sum  Problem 2
Math › Geometry › Triangles
How to apply the triangle angle sum theorem when you need to solve for x. 
The HalfAngle Identities  Problem 2
Math › Trigonometry › Advanced Trigonometry
How to use a halfangle formula to evaluate cos(105).