Which of the following statements about using a protractor are correct?

The protractor measures angles up to 90°.
The vertex of the angle must be at the 0° mark.
One ray of the angle must point at 0°.
The protractor measures angles that open from left or from the right.

Question

Which of the following statements about using a protractor are correct?

The protractor measures angles up to 90°.
The vertex of the angle must be at the 0° mark.
One ray of the angle must point at 0°.
The protractor measures angles that open from left or from the right.

anonymous · Answer

No protractor can measure up to 180°

anonymous · Answer

Most protractors measure up to 180 degrees.

The vertex doesn't point.

When used in the usual manner, one ray of the angle does point to zero degrees.

By changing its orientation, the protractor can measure angles that open from the left or right.