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Handout
Oswego City School District

Regents Exam Prep Center: Exterior Angles of Polygons

For Students 6th - 8th
This site explains what the measure of the sum of exterior angles is for any polygon, and shows how to find the measure of individual exterior angles for regular polygons with a drawn example.
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Handout
Free Math Help

Free Math Help: Exterior Angle of a Triangle

For Students 7th - 8th Standards
This tutorial discusses exterior angles of a triangle. Example problems with explanations are included.
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Activity
AAA Math

Aaa Math: Finding the Third Angle of a Triangle

For Students 9th - 10th Standards
Finding the third angle of a triangle becomes easier by the explanation and examples presented.
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Unit Plan
Texas Education Agency

Texas Gateway: Making Conjectures About Other Polygons

For Students 9th - 10th
Given information about the properties of polygons, students will verify theorems about the relationships, including the sum of interior angles, and apply these relationships to solve problems.
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Interactive
Calculator Soup

Calculator Soup: Triangle Theorems Calculator

For Students 9th - 10th Standards
Each calculation option has sub-bullets that list the sequence of methods used in this calculator to solve for unknown angle and side values including Sum of Angles in a Triangle, Law of Sines, and Law of Cosines.
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Activity
Free Math Help

Free Math Help: Angles of a Triangle Sum

For Students 9th - 10th
The lesson discusses the angle-sum theorem. The resource consists of an explanation and practice problems with solutions.
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PPT
Sophia Learning

Sophia: Using Triangles to Find the Sum of Interior Angles: Lesson 1

For Students 9th - 10th
This lesson demonstrates how to use triangles to determine the sum of the interior angles of a polygon. It is 1 of 5 in the series titled "Using Triangles to Find the Sum of Interior Angles."
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PPT
Sophia Learning

Sophia: Triangle Interior Angles Practice: Lesson 5

For Students 9th - 10th
This lesson provides practice problems that involve the sum of the interior angles of triangles. It is 5 of 6 in the series titled "Triangle Interior Angles Practice."
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PPT
Sophia Learning

Sophia: Triangle Interior Angles Practice: Lesson 1

For Students 9th - 10th
This lesson provides practice problems that involve the sum of the interior angles of triangles. It is 1 of 6 in the series titled "Triangle Interior Angles Practice."
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Handout
CK-12 Foundation

Ck 12: Geometry: Triangle Relationships Study Guide

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This study guide reviews terminology for triangles, triangle properties, different types of triangles, and interior and exterior angle theorems.
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Activity
Texas Instruments

Texas Instruments: Measuring Polygons an Introduction to Cabri Jr.

For Teachers 9th - 10th
This activity is designed as an introduction to using the Carbri Jr. application on the TI-83+/84+ calculators. Students are guided through the menu system and are shown how to draw triangles, quadrilaterals and and a pentagon. Perimeter...
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Lesson Plan
OER Commons

Oer Commons: Exploring Polygons

For Teachers 6th - 8th
In this lesson, students explore different polygons by drawing them, measuring angles, and manipulating interactive sketches to find the angle sum for any polygon. Students also explore the angle measures in regular polygons. Included...
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Activity
Windstream

Ojk's Precalculus Study Page: Double and Half Angle Formulas

For Students 9th - 10th Standards
This tutorial introduces the double-angle and half-angle formulas for sine, cosine, and tangent, and gives sample application and proof exercises. Assumes knowledge of the sum and difference formulas.
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Unit Plan
Texas Education Agency

Texas Gateway: Writing Geometric Relationships

For Students 7th - 9th Standards
Given information in a geometric context, students will be able to use informal arguments to establish facts about the angle sum and exterior angle of triangles, the angles created when parallel lines are cut by a transversal, and the...
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Interactive
University of Colorado

University of Colorado: Ph Et Interactive Simulations: Vector Addition

For Students 9th - 10th Standards
Learn how to add vectors. Drag vectors onto a graph, change their length and angle, and sum them together. The magnitude, angle, and components of each vector can be displayed in several formats.
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Interactive
University of Colorado

University of Colorado: Ph Et Interactive Simulations: Vector Addition

For Students 9th - 10th Standards
Learn how to add vectors. Drag vectors onto a graph, change their length and angle, and sum them together. The magnitude, angle, and components of each vector can be displayed in several formats.
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Activity
National Council of Teachers of Mathematics

The Math Forum: Problems Library Geometry Triangles

For Students 9th - 10th Standards
This site contains a wealth of problems that deal with the basic definitions of medians, altitudes, angle bisectors, and perpendicular bisectors or the defining characteristics of the different types of triangles. There are also...
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Activity
Texas Instruments

Texas Instruments: Properties of the Centers of a Triangle

For Teachers 9th - 10th
Students investigate the sum of the measures of the interior angles of a triangle. This activity explores interior angles, and their relationship with the exterior angles of a triangle [Requires Adobe Reader.]
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Handout
Other

Sierra College: Trigonometric Identities

For Students 9th - 10th Standards
Provides trigonometric identities, which include fundamental identities, even-odd identities, addition formulas, double-angle formulas, subtraction formulas, product-sum formulas, and identities for sin squared and cos squared.
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Activity
Varsity Tutors

Varsity Tutors: Hotmath: Graphing Calculator Practice Problems Geometry

For Students 9th - 10th Standards
Practice using your graphing calculator for Geometry problems. If you get stumped or if you would like to check your work, then select the View Solution button, which is located directly under each problem.
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Whiteboard
ClassFlow

Class Flow: Investigating Regular Polygons

For Teachers 9th - 10th
[Free Registration/Login Required] In this lesson students are introduced to regular polygons. Students learn how to find the drawing angle of any given polygon, exterior angle, interior angle and the sum of the angles for a regular...
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Activity
Math Is Fun

Math Is Fun: Triangles Contain 180 Degrees

For Students 9th - 10th Standards
Students learn about the angle-sum theorem. A definition, example, and proof are included.
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Activity
Homeschool Math

Homeschool Math: Equilateral, Isosceles, and Scalene Triangles

For Students 4th - 6th
This geometry lesson defines equilateral, isosceles, and scalene triangles, and has a variety of exercises, including drawing exercises.
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Unit Plan
Texas Education Agency

Texas Gateway: Making and Verifying Conjectures About Triangles

For Students 9th - 10th
Given examples of triangles and their component parts, the student will use explorations and concrete models to verify and apply the and find the sum of interior angles.

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