Decide if each statement is true or false. Explain your reasoning.

1. A ray that turns all the way around its starting point has made a full turn or has turned .

   

   What fraction of a full turn is each of the following angle measurements?

2. Your teacher will give you a protractor, a tool for measuring the number of degrees in an angle.

   1. How is shown on the protractor?
   2. How many measurements do you see?

3. A protractor with no numbers has been placed over an angle.

   • The center of the protractor is lined up with the vertex of the angle.

   • The straight edge of the protractor lines up with a ray of the angle.

   How many degrees is this angle? Explain how you know.

   

4. An angle contains thirty angles. How many degrees is this angle?

   

1. Here are 4 angles. A protractor has been placed over each angle. Measure the size of each angle in degrees.

   1. 
      

      

   2. 
      

      

   3. 
      

      

   4. 
      

      

2. Elena and Kiran measure an angle with a protractor. Elena says the angle is . Kiran says the angle is . Why are the measurements different? Which measurement is correct? Explain your reasoning.