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46 reviewed resources for nonagons

Lesson Planet

Sum of Interior Angles

For Students 10th
In this sum of interior angles 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 dodecagon. Then,...
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The Greedy Triangle

For Teachers 1st - 2nd
Students examine the name of a number of geometric shapes including the triangle, quadrilateral, pentagon, hexagon, octagon, nonagon, and decagon. They listen to a reading of Marilyn Burns, "The Greedy Triangle," before making shapes...
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"The Greedy Triangle"

For Teachers 1st - 4th
Students recognize the following geometrical shapes: triangle, quadrilateral, pentagon, hexagon, octagon, nonagon, and decagon and demonstrate understanding by being able to identify the shapes listed above.
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Properties of Angles

For Students 10th
In this properties of angles worksheet, 10th graders solve and complete 3 different types of problems. First, they calculate the value of the missing angles in each diagram and explain the reasons for their answer. Then, students...
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Identify Geometric Shapes

For Students 5th - 6th
In this identify geometric shapes learning exercise, students identify eleven shapes as either triangles, nonagons or quadrilaterals.
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What is a Polygon?

For Teachers 4th - 8th
What makes a figure a polygon? Does it have three or more sides? Is it a closed figure? If the answer is yes to both of those questions then it's a polygon. But wait! Some of these polygons have special names based on the number of sides...
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Polygon Mobiles

For Teachers 4th - 6th
Students explore a variety of shapes and angles and create mobiles with information about a selected polygon. Both common and "not-so common" polygons are examined.
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Polygons

For Students 10th
In this polygons worksheet, 10th graders solve and complete 39 various types of geometry problems. First, they use the number of sides to determine the type of polygon the shape represents and whether it is convex or concave. Then,...
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Interior and Exterior Angles

For Students 10th
In this angles worksheet, 10th graders solve and complete 55 various types of problems. First, they find the sum of the measures of the interior angles of the convex polygon. Then, students find the measure of a central angle of a...
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Tessellations: Geometric Patterns

For Teachers 7th - 12th
Students create tessellation drawings using repeating geometric shapes.
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The Shape Show

For Teachers 1st - 2nd
Define plane shapes by their properties, then use this game to reinforce those skills. Learners use given properties as clues to determine each shape. They work to name ten different shapes, six of which are polygons.
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Circles: A Geometric Perspective

For Teachers 10th - 12th Standards
Circles are the foundation of many geometric concepts and extensions - a point that is thoroughly driven home in this extensive unit. Fundamental properties of circles are investigated (including sector area, angle measure, and...
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Common Geometric Figures

For Students 8th - 11th Standards
Geometry could be called the study of figures. An overview of the figures found in a typical geometry course contains a study of different triangles, quadrilaterals, and regular polygons. 
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Using R&R to Teach Mathematics

For Teachers 2nd
Second graders create a shape garden. In this polygons lesson, 2nd graders practice making shapes using a geoboard and read the book The Greedy Triangle by Marilyn Burns.  Students also design a shape garden using construction paper.
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Mathematics Vocabulary Cards – Grade 4

For Teachers 3rd - 5th
An excellent way to reinforce math vocabulary in your classroom! Seventy-eight posters focus on number and number sense, computation and estimation, measurement, geometry, probability and statistics, and patterns, functions, and algebra.
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5th Grade CCSS Vocabulary Word List

For Teachers 5th
Develop the academic language of fifth grade mathematicians with this list of Common Core vocabulary. Accompanied by a series of word cards that support each term with examples and images, this resource is a valuable tool for any fifth...
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The Greedy Triangle

For Teachers 2nd
Second graders discover geometric shapes by listening to a story.  In this geometry lesson, 2nd graders read the story The Greedy Triangle in class and create shapes spoken about in the book with construction paper.  Students discuss the...
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The Greedy Triangle

For Teachers 1st - 4th
Students make designated geometrical shapes using geoboards. In this geometry lesson, students listen to Marilyn Burns, The Greedy Triangle, while listening for the names of geometric shapes. They make the shapes on geoboards by...
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Sum of Interior Angles

For Students 10th
In this sum of interior angles worksheet, 10th graders identify and complete 9 different problems that include identifying various polygons and their angles. First, they complete the table shown on the sheet by determining the number of...
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Identifying Congruent Line Segments

For Teachers 5th - 6th
Young scholars investigate congruent line segments. In this geometry lesson, students review parallel, intersecting and perpendicular lines. Young scholars are then shown various shapes that have congruent lines. Students identify the...
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Name Each Shape

For Students 4th - 5th
In this math worksheet, students analyze 15 pictures of geometric figures and match them to the names which are provided in a word bank. Students tell how many lines of symmetry each shape has.
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Obtuse Angles

For Teachers 3rd
Third graders recognize and identify geometric shapes, work with manipulatives to reinforce understanding, and create polygons with various angles to display their knowledge of the different types of angles.
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Geometric Shapes

For Teachers 5th - 7th
Students identify polygons.  In this geometric shape activity, students explore the characteristics of polygons.  They identify polygons, and classify triangles according to their sides and angles.  Students create a poster representing...
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Perimeter Worksheet

For Students 7th - 8th
In this perimeter worksheet, students find the perimeter of given regular and irregular polygons. This four-page worksheet contains 20 problems. This interactive worksheet may be completed online or printed for paper use.