Khan Academy
Khan Academy: Geometric Constructions: Circle Tangent (Example 2)
Sal constructs a line tangent to a circle using compass and straightedge.
Khan Academy
Khan Academy: Right Triangle Word Problem
Sal solves a modeling problem where he finds the necessary angle to shoot at a vicious alien.
PBS
Pbs: Measurement and Geometry: Finding the Area of Irregular Figures
Video explains area which is the measure of the surface inside a flat figure and is measured in square units.
PBS
Pbs: Measurement and Geometry: Angles: Vertical and Congruent
Vertical angles lie diagonally opposite one another at an intersection and are always equal in measure. This makes them congruent.
PBS
Pbs: Measurement and Geometry: Angles: Right and Obtuse
Angles are measured in degrees, and are classified as right, obtuse, acute, or straight.
PBS
Pbs: Measurement and Geometry: Angles: Naming
This video demonstrates the three ways for naming an angle: by its vertex, by the three points of the angle, or by a letter or number written within the opening of the angle.
PBS
Pbs: Measurement and Geometry: Ged Formulas: Isolating the Variable
Sometimes problems will ask you to solve for a "missing" dimension. This can be done using an algebraic strategy known as isolating the variable.
PBS
Pbs: Measurement and Geometry: Finding Volume
video segment explores how to find volume using the formula Volume = length x width x height.
PBS
Pbs: Measurement and Geometry: Finding Area
Area is the measure of the surface inside a flat figure and is measured in square units.
Khan Academy
Khan Academy: Tangents of Circles Problem (Example 1)
Sal finds missing angles using the property that tangents are perpendicular to the radius.
Khan Academy
Khan Academy: Geometric Constructions: Circle Tangent
Sal constructs a line tangent to a circle using compass and straightedge.
Khan Academy
Khan Academy: Proof: Segments Tangent to Circle From Outside Point Are Congruent
Sal proves that two tangent segments to a circle that are drawn from the same outside point are congruent.
Khan Academy
Khan Academy: Proof: Radius Is Perpendicular to Tangent Line
Sal proves that the radius that connects the intersection point of a tangent line with the circle is perpendicular to the tangent line.
Khan Academy
Khan Academy: Tangents of Circles Problem (Example 2)
Sal finds a missing angle using the property that tangents are perpendicular to the radius.
Khan Academy
Khan Academy: Tangents of Circles Problem (Example 3)
Sal finds a missing length using the property that tangents are perpendicular to the radius.
Sophia Learning
Sophia: Trigonometric Functions on the Unit Circle: Lesson 2
This lesson explores how trigonometric functions can be represented geometrically on the unit circle. It is 2 of 5 in the series titled "Trigonometric Functions on the Unit Circle."
Sophia Learning
Sophia: Trigonometric Functions on the Unit Circle: Lesson 4
This lesson explores how trigonometric functions can be represented geometrically on the unit circle. It is 4 of 5 in the series titled "Trigonometric Functions on the Unit Circle."
Sophia Learning
Sophia: Trigonometric Functions on the Unit Circle: Lesson 1
This lesson explores how trigonometric functions can be represented geometrically on the unit circle. It is 1 of 5 in the series titled "Trigonometric Functions on the Unit Circle."
Sophia Learning
Sophia: Vertically Shifting the Graph of Tangent and Cotangent
The shifting of the graphs of tangent and cotangent functions in the vertical direction is shown here.
Sophia Learning
Sophia: Determining the Coordinate That Corresponds to an Angle
Given an angle of a circle, this lesson shows how to find the coordinates for the corresponding point on the unit circle.
Sophia Learning
Sophia: Determining the Coordinate That Corresponds to an Angle
Given an angle of a circle, this lesson shows how to find the coordinates for the corresponding point on the unit circle.
Sophia Learning
Sophia: Determining the Coordinate That Corresponds to an Angle
Given an angle of a circle, this lesson shows how to find the coordinates for the corresponding point on the unit circle.