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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Comparing Angles and Sides in Triangles

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students the relationship between opposite angles and sides in triangles and how to use this relationship to compare triangles. students examine...
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Unit Plan
Khan Academy

Khan Academy: Equation Practice With Angle Addition

For Students 7th - 8th Standards
Given the sum of a pair of angles and the algebraic expressions that represent them, form and solve an equation. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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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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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: Angle Measures in Given Triangles

For Students 6th
[Free Registration/Login may be required to access all resource tools.] Find the degree measure of an unknown angle in given triangles.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Third Angle Theorem Grades 8 10

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Apply the Third Angle Theorem.
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eBook
Math Planet

Math Planet: Geometry: Angles

For Students 9th - 10th Standards
Angles are explained through examples and a video lesson. [0:48]
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Interactive
Mangahigh

Mangahigh: Shape: The Angles Inside a Quadrilateral

For Students 5th - 8th Standards
Test your knowledge of the sum of angles inside a quadrilateral.
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Activity
Texas Instruments

Texas Instruments: Sum of Remote Interior Angles Equals Exterior Angle

For Teachers 9th - 10th
Draw a triangle with exterior angle. Measure the exterior angle and each remote interior angle. Use the Alpha hand to check that the sum of the remote interior angles is always equal to the exterior angle.
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Activity
Texas Instruments

Texas Instruments: Extension: Parallel Lines and the Sum of the Angles

For Teachers 6th - 8th Standards
Students construct a line parallel to the base of a triangle and measure the angles formed. They use the construction to prove that the sum of the measures of the interior angles of a triangle is 180 degrees.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Find the Angle

For Teachers 8th Standards
In this task, 8th graders have to reason with angles and angle measurements, including the sum of the angles in a triangle, to deduce information from a picture. Includes a GeoGebra worksheet that the teacher can use for demonstration...
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Activity
Texas Instruments

Texas Instruments: Sum of Interior Angles in a Triangle With Cabri Jr.

For Teachers 9th - 10th
Students will discover the sum of the interior angles in a triangle using the Cabri Jr. Application.
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Activity
Texas Instruments

Texas Instruments: Angle Sum in Triangles Proof: Rotation and a Parallel Line

For Teachers 9th - 10th Standards
This investigation uses Cabri Jr. and a cleaver rotation of a triangle to "prove" that the angles in a triangle add up to 180. This could be used to reinforce triangles and paralled lines as well as introduce the concept of rotating an...
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Activity
Texas Instruments

Texas Instruments: Exterior and Interior Angle Theorem

For Teachers 9th - 10th
In this activity, students investigate the relationship between the exterior angle of a triangle and its remote interior angles. They study the Triangle Sum Theorem and the Exterior Angle Theorem.
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Unit Plan
CK-12 Foundation

Ck 12: Angle Measures

For Students 9th - 10th
[Free Registration/Login Required] Students explore the concept of finding triangle angle measurement by navigating through the interactive learning module and then answering questions that go along with the module. Students can also...
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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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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g.a Triangle's Interior Angles

For Teachers 8th Standards
In this task, 8th graders are presented with a drawing of two parallel lines with a triangle touching them at all three of its vertices. They are asked to prove that the sum of the triangles' angles equals 180 degrees. Aligns with 8.G.A.5.
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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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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Find the Missing Angle

For Teachers 8th Standards
In this task, 8th graders are presented with a drawing of two parallel lines connected through two line segments. They are given the measures of two angles and are asked to find a third. Aligns with 8.G.A.5.
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Unit Plan
CK-12 Foundation

Ck 12: Triangle Sum Theorem

For Students 9th - 10th
[Free Registration/Login Required] Students explore the concept of the triangle sum theorem by navigating through the interactive learning module and then answering questions that go along with the module. Students can also learn more...
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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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