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Lesson Plan
Curated OER

Triangle's Interior Angles

For Teachers 7th - 9th Standards
Given a pair of parallel lines and a triangle in between, geometers prove that the sum of the interior angles is 180 degrees. This quick quest can be used as a pop quiz or exit ticket for your geometry class.
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Lesson Plan
Willow Tree

Interior Angles, Exterior Angles, and Diagonals of Polygons

For Students 8th - 11th Standards
How does the number of sides of a polygon affect the angle measures? Learners recognize a pattern in finding the total measure of interior and exterior angles and the number of diagonals. They use the patterns to calculate the number of...
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Worksheet
Curated OER

Sum of Interior Angles

For Students 10th
In this sum of interior angles instructional activity, 10th graders solve 10 different problems that are related to determining the sum of various interior angles in figures. First, they determine the sum of the interior angles of a...
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Worksheet
Curated OER

Interior and Exterior Angles of Polygons

For Students 10th
In this angles of polygons learning exercise, 10th graders solve and complete 18 different problems that include determining various interior and exterior angles. First, they determine the measure of various angles described in the first...
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Lesson Plan
Curated OER

Tile Patterns II: Hexagons

For Teachers 7th - 9th Standards
After learning that the sum of interior angles for triangles is 108 degrees, take it further to show that the sum of angles in any polygon is the same! Using hexagons, pupils practice finding the measure of the six congruent angles. Make...
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Lesson Plan
Curated OER

Tile Patterns I: Octagons and Squares

For Teachers 7th - 9th Standards
This can be used as a critical thinking exercise in congruence or as a teaching tool when first introducing the concept. Four octagons are arranged in such a way that a square is formed in the middle. With this information, geometry...
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Worksheet
Curated OER

Relationship between Exterior and Remote Interior Angles in a Triangle

For Students 9th
In this triangle worksheet set, 9th graders find the relationship between the exterior and remote interior angles in triangles. They determine the formula, and apply it in 15 problems. They use a compass as needed to measure angles.
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Worksheet
Curated OER

Interior, Exterior, and on the Angle

For Students 10th
For this geometry worksheet, 10th graders determine if the given point is in the exterior, interior, or on the given angle.  The one page worksheet contains eight problems.  Answer key is provided. 
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Interactive
Curated OER

Interior Angles of Polygons

For Students 9th - 12th
In this online math worksheet, students determine the interior angles of polygons given their exterior measurements. This excellent resource allows the students to check their answers, and to get "hints" should they run into...
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Interactive
Curated OER

Interior and Exterior Angles of Polygons

For Students 9th - 12th
In this online math worksheet, students find the interior and exterior angles of polygons. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A terrific teaching tool!
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Worksheet
Curated OER

Interior and Exterior Angles

For Students 10th
In this interior and exterior angles worksheet, 10th graders solve 10 different problems that include determining the interior and exterior of various triangles. They determine the measure of an exterior angle and then they determining...
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Lesson Plan
Curated OER

Alternate Interior Angles

For Teachers 9th - 12th Standards
Label angles of parallel lines to analyze the angles created by a transversal and two parallel lines. They graph their lines and observe the similarity and difference in the angles.
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Lesson Plan
Hotchalk

Triangle Sum Theorem

For Teachers 8th - 10th Standards
Your visual geometry learners will appreciate triangle drawings as they model the triangle sum theorem and algebraically solve to find the missing interior angle in a triangle. Practice problems increase in complexity and vary in their...
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Worksheet
Math Worksheets Land

Co-Interior Angles Worksheet

For Students 6th - 9th Standards
Examine parallel lines with a transversal. From the given information, geometry fledglings find the angle measurement of interior angles. This two-page task contains six multi-step problems. Answers are provided on the last page.
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Lesson Plan
Curated OER

Interior and Exterior Angles of Polygons

For Teachers 9th - 10th
Young scholars identify interior and exterior angles of polygons. In this geometry lesson, students add interior and exterior angles of polygons. They use angle theorems to solve the problems.
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Lesson Plan
Curated OER

Sum of Interior/Exterior Angles with Wilbur

For Teachers 7th - 10th
Students identify the interior and exterior measures of polygons. In this geometry instructional activity, students identify the formula for interior angles of polygons. They differentiate between triangular and polygons angles.
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Worksheet
Curated OER

Angles in Polygons

For Students 10th - 12th
In this angles in polygons worksheet, students determine the value of a missing angle measure. They find the value of interior angles and exterior angles. Polygons include triangles, quadrilaterals, pentagons, and hexagons. This...
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Lesson Plan
Curated OER

Exploring Characteristics of Triangles

For Teachers 9th - 11th
Students draw triangles and explore the classification of each using the measures of interior angles and lengths of sides. They investigate the sum of the interior angles of various triangles and conjecture and prove the theorem: The...
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Worksheet
Curated OER

Shapes and Designs

For Students 10th
In this shapes and designs worksheet, 10th graders solve and complete 6 different types of problems. First, they fill in the first two columns of the table show with their shapes. Then, students measure the interior angles of each...
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Lesson Plan
Curated OER

Measuring Angles in a Quadrilateral

For Teachers 9th - 12th Standards
High schoolers explore quadrilaterals in this geometry lesson. They will draw a quadrilateral, measure the angles, and find the sum of the measures of the interior angles using Cabri Jr. The interactive capabilities of Cabri Jr. allow...
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Worksheet
Curated OER

Geometry Lines and Angles

For Students 10th
In this lines and angles worksheet, 10th graders solve and complete types of problems that include different line segments and angles to identify. First, they determine whether each line is parallel, skew, or perpendicular in the diagram...
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Worksheet
Curated OER

Polygons Homework

For Students 9th - 12th
In this polygons worksheet, high schoolers identify polygons that contain given parameters.  They write definitions of polygons.  Students find the measurement of exterior and interior angles of regular polygons.  This two-page worksheet...
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Worksheet
Curated OER

Geometric Figure Quiz

For Students 9th - 12th
In this geometric figure instructional activity, students answer 10 multiple choice questions about geometric figures.  Students find missing angles, interior angles, properties of polygons, etc.
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Worksheet
Curated OER

Challenge: Skills and Applications Lesson 3.3

For Students 9th - 12th
In this angle measures worksheet, students solve 9 short answer problems. Students find values for x and y given two parallel lines cut by a transversal. Students use alternate interior, supplementary, and exterior angles to find x and y.

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