359 Videos for "angles"

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. 
Radii to Tangents  Concept
Math › Geometry › Circles
How to define a tangent line; how to determine the angle a radius to a tangent forms. 
Rotations  Problem 3
Math › Geometry › Transformations
How to find the angle of rotation in an isometry where the point of rotation is not given. 
Using a Protractor  Concept
Math › Geometry › Geometry Building Blocks
How to use a protractor to measure an angle. 
Rhombus Properties  Problem 2
Math › Geometry › Polygons
How to find the length of diagonals and angles in a rhombus. 
Radii to Tangents  Problem 1
Math › Geometry › Circles
How to calculate the central angle formed by radii to tangents that intersect at a point outside the circle. 
Rhombus Properties  Problem 1
Math › Geometry › Polygons
How to find the angles in a rhombus created by drawing one diagonal. 
Special Isosceles Triangle Properties  Concept
Math › Geometry › Triangles
How to identify a segment from the vertex angle in an isosceles triangle to the opposite side. 
Constructing Parallel Lines  Problem 1
Math › Geometry › Constructions
How to construct parallel lines using corresponding angles. 
Corresponding Parts of Similar Triangles  Problem 1
Math › Geometry › Similarity
How to find the length of an angle bisector using similar triangles. 
Constructing Parallel Lines  Problem 2
Math › Geometry › Constructions
How to construct parallel lines using alternate interior angles. 
Properties of Similar Polygons  Problem 1
Math › Geometry › Similarity
How to identify if two quadrilaterals are similar, given three angles and four sides. 
The Definitions of Sine and Cosine  Problem 2
Math › Trigonometry › Trigonometric Functions
How to find the sine of an angle when its cosine is given. 
Corresponding Parts of Similar Triangles  Concept
Math › Geometry › Similarity
How to relate corresponding altitudes, medians and angle bisectors in similar triangles. 
Rectangle and Square Properties  Problem 1
Math › Geometry › Polygons
How to find the angles in a square created by drawing diagonals, and finding the lengths of those diagonals. 
The Definitions of Sine and Cosine  Problem 2
Math › Precalculus › Trigonometric Functions
How to find the sine of an angle when its cosine is given. 
The Sine Addition Formulas  Problem 2
Math › Trigonometry › Advanced Trigonometry
How to derive the sine of a difference formula and use it to find the sine of an angle. 
Constructing Parallel Lines  Problem 3
Math › Geometry › Constructions
How to construct parallel lines using alternate exterior angles. 
Radii to Tangents  Problem 2
Math › Geometry › Circles
How to calculate the measure of a missing angle in a quadrilateral formed by two circles that are tangent but not congruent and their radii drawn to a common line of tangency. 
The Sine Addition Formulas  Problem 2
Math › Precalculus › Advanced Trigonometry
How to derive the sine of a difference formula and use it to find the sine of an angle.