Study these web animations:
Using a Protractor to Measure Angles   at:   http://www.mathopenref.com/constmeasureangle.html
Animation: Using a Protractor to Draw an Angle   at:   http://www.mathopenref.com/constdrawangle.html


Use a protractor to measure the specified angles:

the measure of  ∠BAC  is __________	the measure of  ∠CAD  is __________	the measure of  ∠BAD  is __________
Two of your angle measures should sum to the third. Check that this is true:

 

Use your protractor to draw a  37°  angle with vertex  A  and with  AB→   as one of its sides. Then, label a point  C  on the other side of the angle. Use your protractor to draw a  49°  angle with vertex  A  and with  AC→   as one of its sides. Compare with the sketch on the opposite side!