55 Videos for "right angle"

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. 
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. 
Same Side Interior and Same Side Exterior Angles  Problem 1
Math › Geometry › Reasoning, Diagonals, Angles and Parallel Lines
How to find missing angles in a right trapezoid by identifying same side interior and exterior angles. 
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. 
Radian Measure of Angles  Concept
Math › Precalculus › Trigonometric Functions
How to measure angles using degrees or radians. 
Radian Measure of Angles  Concept
Math › Trigonometry › Trigonometric Functions
How to measure angles using degrees or radians. 
Supplementary and Complementary Angles  Concept
Math › Geometry › Geometry Building Blocks
How to identify supplementary and complementary angles. 
Supplementary and Complementary Angles  Problem 1
Math › Geometry › Geometry Building Blocks
How to use angle measures to identify supplementary and complementary angles. 
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. 
Similar Triangles in Circles and Right Triangles  Problem 1
Math › Geometry › Similarity
How to find missing side lengths of triangles in a circle. 
Angles: Types and Labeling  Problem 1
Math › Geometry › Geometry Building Blocks
How to define congruent angles. How to label adjacent angles. 
Radii to Tangents  Concept
Math › Geometry › Circles
How to define a tangent line; how to determine the angle a radius to a tangent forms. 
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. 
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. 
Trigonometric Ratios: Cosine  Concept
Math › Geometry › Basic Trigonometry
How to define the cosine ratio and identify the cosine of an angle in a right triangle. 
Trigonometric Ratios: Sine  Concept
Math › Trigonometry › Basic Trigonometry
How to define the sine ratio and identify the sine of an angle in a right triangle. 
Inverse Trigonometric Functions  Concept
Math › Geometry › Basic Trigonometry
How to use inverse trig functions to find angles in right triangles. 
Trigonometric Ratios: Cosine  Problem 1
Math › Trigonometry › Basic Trigonometry
How to find the cosine of an angle in a right triangle. 
Inverse Trigonometric Functions  Concept
Math › Precalculus › Basic Trigonometry
How to use inverse trig functions to find angles in right triangles. 
Trigonometric Ratios: Cosine  Concept
Math › Trigonometry › Basic Trigonometry
How to define the cosine ratio and identify the cosine of an angle in a right triangle.