1. What is a perpendicular bisector ?

A perpendicular bisector is a line which cuts another line in two equal parts and at an angle of 90o.

2. What are compasses?

Compasses are a device for drawing circles. (They have a point on one end and a pencil or lead at the other.)

3. Can you use a ruler or protractor to draw constructions?

A question in a test or exam will usually state the equipment that can be used.

4. What is a protractor?

A protractor is a device for measuring or drawing angles.

The most common type is a small piece of plastic in a semi-circular shape.