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Lesson: Geometry - 06

Terms And Rules

[Page 6 of 30]

Let's review some terms and rules that you might see on your standardized test.

An angle or line that is bisected has been cut in half.

A right angle has a degree measurement of 90°. It is formed whenever two lines are perpendicular. The symbol for perpendicular lines is ? .

Lines are parallel if they lie in the same plane and never intersect, no matter how far they are extended.

If two lines are parallel, and one of the two is perpendicular to a third line, then both lines are perpendicular to the third line.

A straight line that intersects two parallel lines is known as a transversal. Since a transversal intersects both parallel lines at the same angle, the angles formed mirror each other.

In the figure above, a° = e°, d° = h°, b° = f°, and c° = g°.

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