There are a number of terms that are used throughout Geometry that need to be known.
A point is a specific location on a diagram or on a graph. It may be shown on a diagram, or given as a measurement or as a set of co-ordinates.
A line is a path between two points. A straight line is the shortest distance between two point. A line has a length.
Parallel lines are two, straight lines that always stay the same distance apart (like straight railway lines). The lines never meet.
An angle is the measurement of the turn between two intersecting lines and is measured in degrees.
An angle of 90 degrees is a right angle. Where one line intersects another line at right angles, the lines are said to be perpendicular to each other. A right angle is shown on a drawing with a squared angle symbol, rather than a curved angle symbol.
1. What is an angle of 90º called?
Answer: A Right Angle
A Right Angle is 90º. It is shown as a square on diagrams, rather than as a curve.
2. What is the angle formed by a perpendicular line?
A perpendicular line intersects another line at a right angle, or 90º.