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An Angles Worksheets - by HelpingWithMath.com

180° In a Triangle Experiment

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Follow the instructions below to show that there are 180° in a triangle.

step 1 of triangle experiment step 2 of triangle experiment step 3 of triangle experiment

1. Cut out the triangle as close to the lines as possible.

2. Cut or carefully tear the triangle into three similar sizes as shown above.

3. Line up the pieces along a straight line with the three vertices touching.

 

triangle for cutting a aligning vertices

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Follow the instructions below to show that there are 180° in a triangle.

Step 1 of 2nd triangle experiment Step 2 of 2nd triangle experiment Step 3 of 2nd triangle experiment

1. Cut out the triangle as close to the lines as possible.

2. Cut or carefully tear the triangle into three similar sizes as shown above.

3. Line up the pieces along a straight line with the three vertices touching.

 

triangle for cutting a aligning vertices

You will find a related lesson on finding missing angles here. There is also a similar activity in this how many degrees in a quadrilateral worksheet.

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Related Resources

The various resources listed below are aligned to the same standard, (8G05) taken from the CCSM (Common Core Standards For Mathematics) as the Geometry Worksheet shown above.

Use informal arguments to establish facts about the angle sum and exterior angle ...

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Worksheets

Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:

Understand congruence and similarity using physical models, transparencies, or geometry software

 

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