Right Angles

Right Angles

More Alphabet Geometry

Angles
Parallel Lines
Symmetry
Transformations

Right Angles

Introduction

Definition

Review

Quick Quiz

Students should be able to:

identify and describe the relative size of acute and obtuse angles with respect to right angles.

Introduction to Right Angles: The Letter L

Let's review three types of angles. Check them out below:

1 - acute angle; 2 - right angle; 3 - obtuse angle

Which angle looks like the letter L?

You've got it...the right angle looks like the letter L.

What can you learn by looking at the letter L?

Use this mini-movie on your SMARTBoard

When you look at the letter L, you see a RIGHT ANGLE, or an angle with a measure of 90º.

A right angle is larger than an acute angle...

...but smaller than an obtuse angle.

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Right angles are everywhere!

Right angles on a brick wall

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Right angles on a tile floor

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Are there other letters with right angles?

There are four letters that are all right angles. Try to see the alphabet in your head as you say the letters. Figure out which four letters are all right angles. Make an educated guess and then click the button below to see what they are. Note: L is not included because you already know it is a right angle. I is not either because sometimes it is just a straight line.

Use this mini-movie on your SMARTBoard

Quick Quiz