Geometry
BASIC CONCEPTS OF GEOMETRY
If angles are next to each other, they are called adjacent angles. If the sum of two angles equals
90°, they are called complimentary angles. For example, 27° and 63° are complimentary angles.
If the sum of two angles equals 180°, they are called supplementary angles. For example, 73°
and 107° are supplementary angles.
Summary
The important information in this chapter is summarized below.
Lines and Angles Summary
Straight lines are parallel when they are in the same plane and do
not intersect.
A straight angle is 180°.
An acute angle is less than 90°.
A right angle is 90°.
An obtuse angle is greater than 90° but less than 180°.
If the sum of two angles equals 90°, they are complimentary
angles.
If the sum of two angles equals 180°, they are supplementary
angles.
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