Civil Engineering Reference
In-Depth Information
RIGHT ANGLES
ACUTE ANGLE
PERPENDICULAR LINES
(A)
(B)
COMPLEMENT OF ANGLE
q
OBTUSE ANGLE
SUPPLEMENT
OF ANGLE
q
(C)
(D)
Figure 5-10 Various angles: (A) right, (B) acute, (C) obtuse,
and (D) complement and supplement of an angle.
PLANE SURFACE
EVERY POINT ON
LINE LIES IN
THE SURFACE
Figure 5-11 A plane surface means that every point on a
straight line joining any two points in the surface lies in the
surface.
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