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Activity
Texas Instruments

Texas Instruments: Angles in a Polygon

For Teachers 9th - 10th
Students will expore the interior and exterior angle of 3 polygons and develop the formula to calculate the sum of degrees without the measurement of the angles being taken.
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Activity
Texas Instruments

Texas Instruments: Angles of a Triangle

For Teachers 9th - 10th
In this activity, students investigate the sum of the measures of the interior angles of a triangle. They will explore interior angles, and their relationship with the exterior angles of a triangle.
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Activity
Texas Instruments

Texas Instruments: Exterior Angle Sums With Cabri Jr.

For Teachers 9th - 10th
A Cabri Jr. activity studying exterior angle sums.
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Handout
Math Open Reference

Math Open Reference: Interior Angles of a Polygon

For Students 9th - 10th
Learn about interior angles of a polygon with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
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Interactive
Mangahigh

Mangahigh: Shape: Exterior Angles of Polygons

For Students 9th - 10th
Explain that the sum of exterior angles of polygons equal 360 degrees.
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Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Angle Sums

For Students 9th - 10th
Students may use this computer applet to explore angle sums of triangle, quadrilaterals, pentagons and hexagons.
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Activity
Math Is Fun

Math Is Fun: Angles on a Straight Line

For Students 3rd - 8th Standards
This very basic website gives a clear, simple explanation of the sum of angles on a straight line that when put together form a straight angle.
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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
CK-12 Foundation

Ck 12: Elem Math: Determining the Unknown Angle in a Right Triangle

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview and attempt practice problems on finding a missing angle in a right triangle.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Sum Theorem Grade 7

For Students 7th
[Free Registration/Login may be required to access all resource tools.] Recognize the sum of the interior angles of a triangle as 180 degrees.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Sum Theorem Grades 8 10

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Recognize the sum of the interior angles of a triangle as 180 degrees.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Interior Angles in Convex Polygons

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Find the sum of the interior angles of a convex polygon.
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Unknown Type
Khan Academy

Khan Academy: Find Trig Values Using Angle Addition Identities

For Students 9th - 10th Standards
Find the trigonometric values of various angles that (while they are not special angles) can be expressed as the sum or difference of special angles. Students receive immediate feedback and have the opportunity to try questions...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Interior Angles in Convex Polygons

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to calculate the sum of the interior angles of a polygon and the measure of one interior angle of a regular polygon.
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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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Unknown Type
Khan Academy

Khan Academy: Using the Trig Angle Addition Identities

For Students 9th - 10th Standards
Find the trig values of sums of angles whose individual trig values are known. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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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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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
Other

Gobierno De Navarra: Medidas De Angulos

For Students 9th - 10th Standards
Interactive figures to learn about the sum of the measurement of the angles of different plane figures.
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Activity
Varsity Tutors

Varsity Tutors: Hotmath: Exterior Angles

For Students 9th - 10th
This interactive tool has student explore the topic of exterior angles of a polygon. The tool allows learners to change the number of sides to find the sum of the exterior angles of a variety of polygons.
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Interactive
Walter Fendt

Walter Fendt: Sum of Angles in a Triangle

For Students 9th - 10th
A short interactive activity to show that the sum of the angles of a triangle is 180 degrees.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf Sum and Difference Angle Formulas

For Teachers 9th - 10th Standards
The goal of this task is to have learners derive the addition and subtraction formulas for cosine and tangent, and the subtraction formula for cosine, from the sum formula for sine. Aligns with F-TF.C.9.
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Activity
Texas Instruments

Texas Instruments: Measuring Angles in a Quadrilateral

For Teachers 9th - 10th Standards
In this activity, use an interactive, and investigative approach to determining the sum of the interior angles of a quadrilateral. They use Cabri Jr. to draw, measure, and calculate the characteristics of the angles of quadrilaterals.

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