Definition of Terms, Continued
Angles
Angles form when two lines intersect. The symbols for angularity are
(singular) or s (plural). There are a maximum of 180 possible degrees to
an angle. A straight angle is an angle of 180° and appears as a straight line.
Obtuse angles are angles less than 180° but more than 90°. An angle of 90°
is referred to as a right angle because of the relationship between the two
intersecting lines. Acute angles are angles less than 90°. When two angles
are combined to total 90°, they are referred to as complimentary angles.
Supplementary angles form when two angles combine to total 180°. You
may draw angles at any degree of angularity using triangles or a protractor.
To increase accuracy, use a vernier protractor or construct angles using the
tangent, sine, or chord methods.
Figure 2-3 illustrates the different degrees of standard angularity.
Figure 2-3.—Angles.
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