1. Investigating Angles Drawing an Angle
Geometry
Investigating Angles
Drawing an Angle

2. Angles An angle consists of a vertex and two arms.
This angle is named XYZ or ZYX X
arm
vertex
angle Y Z
arm

3. Drawing Angles

4. Drawing Angles Example: Draw an angle DEF with a measure of 65°
Step 1:
To draw an angle, start with one arm of the angle.
Example: Draw an angle DEF with a measure of 65° E F

5. Drawing Angles Example: Draw an angle DEF with a measure of 65° F E
Step 2:
Place a protractor on top, with the vertex and base aligning with the vertex and arm of the angle.
Drawing Angles
Example: Draw an angle DEF with a measure of 65° E F

6. Drawing Angles Example: Draw an angle DEF with a measure of 65°
Step 3:
Place a mark at 65° on the edge of the protractor.
Drawing Angles
Example: Draw an angle DEF with a measure of 65° E F

7. Drawing Angles Example: Draw an angle DEF with a measure of 65°
Step 4:
Remove protractor and draw arm from vertex (E). Label as arm D.
Drawing Angles
Example: Draw an angle DEF with a measure of 65° D
65° E F

8. Drawing Angles Example: Draw an angle RST with a measure of 123°
Step 1:
To draw an angle, start with one arm of the angle.
Example: Draw an angle RST with a measure of 123° R S

9. Drawing Angles Example: Draw an angle RST with a measure of 123° R S
Step 2:
Place a protractor on top, with the vertex and base aligning with the vertex and arm of the angle.
Drawing Angles
Example: Draw an angle RST with a measure of 123° R S

10. Drawing Angles Example: Draw an angle RST with a measure of 123°
Step 3:
Place a mark at 123° on the edge of the protractor.
Drawing Angles
Example: Draw an angle RST with a measure of 123° R S

11. Drawing Angles Example: Draw an angle RST with a measure of 123°
Step 4:
Remove protractor and draw arm from vertex (S). Label as arm T.
Drawing Angles
Example: Draw an angle RST with a measure of 123° T R
123° S