Definition of Terms, ContinuedAnglesAngles form when two lines intersect. The symbols for angularity are (singular) or s (plural). There are a maximum of 180 possible degrees toan 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 twointersecting lines. Acute angles are angles less than 90°. When two anglesare combined to total 90°, they are referred to as complimentary angles.Supplementary angles form when two angles combine to total 180°. Youmay draw angles at any degree of angularity using triangles or a protractor.To increase accuracy, use a vernier protractor or construct angles using thetangent, sine, or chord methods.Figure 2-3 illustrates the different degrees of standard angularity.Figure 2-3.—Angles.Continued on next page2-5

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