Curated OER
How Do You Find Missing Angles in a Transversal Diagram?
Parallel lines with a transversal and one given value, find the value of the other seven angles. There are many geometric terms about angles and lines to know the meaning of and understand their relationship to each other. Understanding...
Khan Academy
Khan Academy: Geometry: Ca Geometry: Exterior Angles
Demonstrates solutions to problems #41-45 of California Geometry released state test questions. Problems address finding volumes of rectangular prisms, exterior angles, interior angle sum, and exterior angle sum. [10:53]
Khan Academy
Khan Academy: Geometry: Ca Geometry: Deducing Angle Measures
Demonstrates how to solve five different problems from a released California Geometry state test that involve finding the measures of angles in different polygons. This video also appears in the Geometry: Worked Examples section. [10:58]
Khan Academy
Khan Academy: Geometry: Sum of the Exterior Angles of Convex Polygon
Demonstrates how to determine that the exterior angle sum of a convex polygon is 360 degrees. Practice problems available. [5:24]
Khan Academy
Khan Academy: Geometry: Challenging Triangle Angle Problem
Demonstrates how to find the sum of the exterior angles of an irregular pentagon by breaking the pentagon into three triangles and using the triangle sum theorem. [8:37]
Sophia Learning
Sophia: Triangle Exterior Angles Practice: Lesson 6
This lesson provides practice problems that apply the triangle exterior angles theorem. It is 6 of 6 in the series titled "Triangle Exterior Angles Practice."
Sophia Learning
Sophia: Interior and Exterior Angles of Polygons
Interior and exterior angles of polygons are investigated in this geometry resource. Definitions and video lessons are included.
Sophia Learning
Sophia: Rectangle Practice Problems
This video lesson describes the characteristics of rectangles and provides examples of how to find area, perimeter, diagonals, and angle measurements. [7:00]
Sophia Learning
Sophia: Triangle Exterior Angles Theorem
Explore how to find the exterior angle of a triangle using information about adjacent angles and opposite angles. Assess learning with a quiz.
Sophia Learning
Sophia: Angles of a Triangle
This video tutorial demonstrates how to find the interior and exterior angles of a triangle.
Virtual Nerd
Virtual Nerd: How Do You Find Measures of Missing Exterior Angles?
The sum of the exterior angles of a polygon is always 360 degrees. Explore this tutorial and see how to use this knowledge to find missing measurements. [3:21]
Virtual Nerd
Virtual Nerd: How Do You Find Missing Angles in a Transversal Diagram?
Take a look at this tutorial to see how to find all the missing angle measurements by identifying vertical, corresponding, adjacent, and alternate exterior angles. [4:43]
Virtual Nerd
Virtual Nerd: Find the Measures of Exterior Angles of a Polygon
If you know the interior angle measurements, you can set up equations using those interior angles and solve to find you exterior angles. Watch this tutorial to see how. [5:18]
Khan Academy
Khan Academy: Geometry: Triangle Angle Example 2
Shows how to find the measure of missing angles using the triangle sum theorem and vertical angles. This video also appears in the Geometry: Triangles strand. [4:55]
Khan Academy
Khan Academy: Triangle Angle Properties: Sum of the Exterior Angles of Polygon
Students explore a more elegant way to find the sum of the exterior angles of a convex polygon.
Khan Academy
Khan Academy: Triangles: Triangle Angle Example 2
Shows how to find the measure of missing angles using the triangle sum theorem and vertical angles.
Khan Academy
Khan Academy: Sum of the Exterior Angles of a Polygon
Sal demonstrates how the the sum of the exterior angles of a convex polygon is 360 degrees.
Sophia Learning
Sophia: Triangle Exterior Angles Theorem: Lesson 2
This lesson introduces the exterior angles theorem of triangles. It is 2 of 5 in the series titled "Triangle Exterior Angles Theorem."
Sophia Learning
Sophia: Triangle Exterior Angles Theorem: Lesson 1
This lesson introduces the exterior angles theorem of triangles. It is 1 of 5 in the series titled "Triangle Exterior Angles Theorem."
Sophia Learning
Sophia: Triangle Exterior Angles Practice: Lesson 4
This lesson provides practice problems that apply the triangle exterior angles theorem. It is 4 of 6 in the series titled "Triangle Exterior Angles Practice."
Sophia Learning
Sophia: Consecutive Exterior Angles Converse
This video lesson demonstrates how to determine if two lines are parallel by using the converse of the consecutive-exterior angles theorem. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Consecutive Exterior Angles Converse
This video lesson demonstrates how to determine if two lines are parallel by using the converse of the consecutive-exterior angles theorem. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Triangle Exterior Angles Practice
This video lesson demonstrates how to use the triangle exterior angle theorem to find interior angle measurements of a triangle. [4:28]