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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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Unit Plan
Oswego City School District

Regents Exam Prep Center: Polygons: Interior and Exterior Angles

For Students 9th - 10th
A great resource where you can learn how to calculate the measures of the interior and exterior angles of any regular polygon with these tutorials. There are several practice pages for someone to try. The teacher resource page includes...
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: A ced.a.1: Sum of Angles in a Polygon

For Teachers 9th - 10th
This problem provides students with an opportunity to discover algebraic structure in a geometric context. They will divide up polygons into triangles. The will use the sum of the angles of 180 degrees for each triangle. Aligns with...
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Unit Plan
Texas Education Agency

Texas Gateway: Geometric Properties of Angle Relationships in Polygons

For Students 9th - 10th Standards
Given numerical and/or geometric patterns that represent geometric properties of angle relationships in polygons, the student will investigate patterns to make conjectures about interior and exterior angles of polygons.
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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determining Unknown Angles in Parallelograms

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

Ck 12: Elem Math: Determining Unknown Angles in Trapezoids

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 the missing angles in a trapezoid.
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Lesson Plan
OER Commons

Oer Commons: Exploring Polygons

For Teachers 6th - 8th
For 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
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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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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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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Activity
Math Is Fun

Math Is Fun: Interior Angles of Polygons

For Students 3rd - 8th Standards
Learn what an interior angle of a polygon is and how you can calculate their value in triangles, quadrilaterals, and pentagons. Includes a chart that overviews the "general rule" for determining the sum of internal angles in any polygon...
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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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Unit Plan
Cuemath

Cuemath: Angle Sum Theorem

For Students 9th - 10th
Explore the world of the angle sum theorem in this mini-lesson. Provides a definition and solved examples that help with understanding their properties. Includes practice questions with answers.
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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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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Exterior 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 exterior angles of regular polygons. Students examine guided notes, review guided practice, watch instructional videos...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Exterior Angles in Convex Polygons

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] In this lesson students find the measure of the exterior angles of a polygon. Students examine guided notes, review guided practice, watch instructional videos and...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Exterior Angles Theorems

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students the sum of exterior angles for any polygon and the relationship between exterior angles and remote interior angles in a triangle....
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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: Interior Angles of Polygons

For Students 9th - 10th
Determine the sum of the interior angles of polygons.
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Activity
Texas Instruments

Texas Instruments: Triangle Sum

For Teachers 9th - 10th Standards
This activity is used to discover that the sum of the measures of the triangle angles is constant and to discover ways of proving the theorem listed in the activity.
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Unit Plan
Mathigon

Mathigon: Geometry: Angles and Polygons: Drawing Triangles

For Students 9th - 10th Standards
This lesson focuses on the Triangle Inequality, when the sum of the lengths of any two sides of a triangle is greater than the length of the third. When this happens, the three sides cannot form a triangle.
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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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Unknown Type
Khan Academy

Khan Academy: Angles of a Polygon

For Students 6th - 8th
Find the sum of interior angles of different polygons.
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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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