Explore the Interior Angles of Regular Shapes

Regular shapes have equal sides and equal angles. You can easily work out the sum of all the interior angles in a regular shape… you just need to know the formula!

Did you know that the interior angle size of any regular polygon can be calculated simply by using the humble triangle? Once students know that the angle sum of a triangle is 180°, calculating the interior angle size of other regular polygons becomes child’s play!

Ready-Made Lessons on Interior Angles

This set of teaching slides has been designed to introduce your students to the interior angles of common 2D shapes. It covers the following topics:

• Finding interior angle size
• Regular and irregular shapes
• Angles types 
• Triangles
• Squares
• Pentagons
• Hexagons
• Octagons

The resource also includes various “Turn and Talk” activities to keep students engaged throughout the presentation. Two “Check for Understanding” activities are also included at the end of the slide deck to make sure students have grasped the concepts presented. 

Tips for Scaffolding and Extension

If you’re juggling multiple learning needs (and we’re sure you are!), here are some ideas for supporting and extending your students when working with this resource: 

• Challenge and Extend Your High Fliers – The presentation includes several “Turn and Talk” questions. Why not have your more-confident students pose their own “Turn and Talk” questions in a similar style to the ones in the presentation? Students could swap with a partner to answer each other’s questions.
• Support Your Less-Confident Students – Some students may need to physically practice using the formula for finding the interior angle sum of the shapes in the presentation by writing it down. This could be done in a small group with targeted adult support. Students could be provided with mini-whiteboards so they can work through each shape at a slower pace to assist with retention of the information. 

It’s As Easy As Download, Project, Teach!

Use the Download button to access the Google Slides version of this resource.

Project onto your interactive screen and work through the slides for a ready-made, paperless Math lesson!

This resource was created by Kaylyn Chupp, a teacher in Florida and a Teach Starter collaborator.

Click below for more time-saving resources to use when teaching angles to your students!

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Interior Angles of Shapes Sorting Activity

Play this sorting game when learning about the interior angles of common two-dimensional shapes.

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Understanding Angles – Vocabulary Cards

Promote math vocabulary development with this set of 15 vocabulary cards focusing on angles.

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Angle Maker Template

Create and classify different angles with this hands-on printable template.