Sophia Learning
Sophia: Equilateral Triangle Interior Angles Practice Problems: Lesson 1
This lesson will provide practice problems that involve solving for unknown angle and side measures of equilateral triangles. It is 1 of 5 in the series titled "Equilateral Triangle Interior Angles Practice Problems."
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 Interior Angles of a Polygon
Demonstrates how to generalize the formula for finding the interior angle sum of a polygon by noticing how many non-overlapping triangles a polygon can be broken into. Practice problems available. [9:10]
Sophia Learning
Sophia: Consecutive Interior Angles Converse
This video tutorial describes and provides an example for proving two lines are parallel with the converse of consecutive-interior angles theorem. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Coordinate Geometry of Rectangles
Coordinate geometry of rectangles is investigated in this video lesson. The tutorial demonstrates how to use the midpoint, distance, and slope formulas to determine if a quadrilateral is a rectangle on a coordinate plane. [17:26]
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: Interior Angles
Explore the interior angles of polygons and the degree of each angle as well as the total degree of the entire polygon. Assess learning with a quiz.
Sophia Learning
Sophia: Introduction to Triangle Similarity
Similar Triangles are explored in this video lesson. Students can check their understanding with an assessment. [5:51]
Sophia Learning
Sophia: Quadrilaterals and Triangles
This video lesson [4:55] describes the characteristics that quadrilaterals and triangles have in common. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Triangle Interior Angles Practice
Determine the value of a variable when solving for the interior angles of a triangle. Check understanding 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.
Sophia Learning
Sophia: Special Right Triangles
Special right triangles are explored in this video tutorial. The lesson provides four videos that explain the side ratios for 45-45-90 and 30-60-90 triangles along with real-world examples involving each type of triangle.
Virtual Nerd
Virtual Nerd: How Do You Find the Sum of the Interior Angles of a Polygon?
If you know the number of sides of a polygon, you can figure out the sum of the interior angles. Take a look at this tutorial to learn how. [6:00]
Virtual Nerd
Virtual Nerd: How Do You Find Missing Angles in a Triangle With Variables?
This tutorial shows you how to use the Triangle Sum Theorem to find the interior angle measurements of a given triangle. [5:09]
Virtual Nerd
Virtual Nerd: How Do You Find a Missing Angle in a Quadrilateral?
This tutorial demonstrates how to create an equation and solve it to find the missing measurements in a quadrilateral. [4:13]
Khan Academy
Khan Academy: Triangle Angle Properties: Sum of Interior Angles of a Polygon
Students explore the interior angles of a polygon by explanding on the concept that a triangle has 180 degrees and developing a formula for all polygons.
Sophia Learning
Sophia: Equilateral Triangle Interior Angles Practice Problems: Lesson 4
This lesson will provide practice problems that involve solving for unknown angle and side measures of equilateral triangles. It is 4 of 5 in the series titled "Equilateral Triangle Interior Angles Practice Problems."
Sophia Learning
Sophia: Triangle Interior Angles Practice: Lesson 4
This lesson provides practice problems that involve the sum of the interior angles of triangles. It is 4 of 6 in the series titled "Triangle Interior Angles Practice."
Sophia Learning
Sophia: Triangle Interior Angles Practice: Lesson 6
This lesson provides practice problems that involve the sum of the interior angles of triangles. It is 6 of 6 in the series titled "Triangle Interior Angles Practice."
Sophia Learning
Sophia: Using Triangles to Find the Sum of Interior Angles: Lesson 2
This lesson demonstrates how to use triangles to determine the sum of the interior angles of a polygon. It is 2 of 5 in the series titled "Using Triangles to Find the Sum of Interior Angles."
Sophia Learning
Sophia: Using Triangles to Find the Sum of Interior Angles
This lesson demonstrates how to use triangles to determine the sum of the interior angles of a polygon.
Sophia Learning
Sophia: Using Triangles to Find the Sum of Interior Angles: Lesson 3
This lesson demonstrates how to use triangles to determine the sum of the interior angles of a polygon. It is 3 of 5 in the series titled "Using Triangles to Find the Sum of Interior Angles."
Sophia Learning
Sophia: Using Triangles to Find the Sum of Interior Angles
This lesson demonstrates how to use triangles to determine the sum of the interior angles of a polygon.