# Properties of Various Angles

By CQueen on Apr 24, 2017

Students will be able to define and identify supplementary, complementary, adjacent and vertical angles.

• Use of Braille protractor
• Tactile Exploration
• Knowledge and understanding of 180º and 90º angles

## Procedure

1. Student will be given tactile graphics (see pictures) of various angles.

2. Supplementary angles will be defined- two angles that equal 180º when their degrees are added together. Tactile representations will be supplied. These angles can be touching, or not touching, as long as the degrees add up to 180º.

3. Allow student to measure with protractor and add angles.

4. Allow student to make his/her own tactile representation using Graphic Art Tape.

5. Complementary angles will be defined- two angles that equal 90º when their degrees are added together. Explain that this makes a right angle. Tactile representations will be supplied. Again, these can be touching, or not touching, as long as they add up to 90º.

6. Allow student to measure using a protractor and add angles.

7. Allow student to make his/her own tactile representation using Graphic Art Tape.

8. Supply tactile representation of vertical and adjacent angles (see picture).

9. Define vertical angles- angles that are across from each other when two lines cross. They are always equal.

10. Define adjacent angles- angles that share the same vertext and 1 side.

11. Give various examples and allow student to identify all 4 types of angles using protractor for measurement, and tactile exploration.

## Extension Activity Suggestions (Real Life Application)

• Give student pizza graphic (thermograph pictured). Identify and describe different types of angles. Use real personal-size pizzas to cut and discuss angles.
• Can also cut pancakes to make angles (and eat!)

## Variations

• Student should become familiar with the use of a protractor by making and measuring various angles
• Extend activities to include real life objects (see suggestions)