Back to module 2 notes
|You need a protractor:
Step 1: Place your protractor over the angle with the center
of the protractor on a vertex and the zero lined up with the ray
of the angle.
Step 2: Find the zero on the protractor and follow the scale
until you hit the next ray. Read the number. That is the measure of the angle.
As you can see, this angle measures 134º. Check the angle to make sure it is obtuse.
|Let's say you want to draw angle CDE with a measure of 78º.
Step 1: Draw one side of the angle, ray DE.
Step 2: Place the center of the protractor on the vertex, point D.
Line up the ray with the base line of the protractor, at 0º.
Step 3: Follow the numbers as they increase from 0º.
Mark a point at 78º.
Step 4: Draw a second ray from the vertex through the point: