Introduction To Geometry Summary Sheet Page 4
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4Ch 1 Summary
Name ____________________________
Circles:
3-D Figures:
circle The set of all points in a plane at a given distance from a given
space An undefined term thought of as the set of all
point.
points. Space extends infinitely in all directions, so it is
three-dimensional.
center (of a circle) The coplanar point from which all points of the
circle are the same distance.
solid A three-dimensional geometric figure that
completely encloses a region of space.
isometric drawing A drawing of a three-dimensional
radius A line segment from the center of a circle or sphere to a point on
object that shows three faces in one view. Also called
the circle or sphere. Also, the length of that line segment.
an edge view.
diameter A chord of a circle that contains the center, or the length of
net A two-dimensional pattern that can be folded to form
that chord.
a three-dimensional figure.
chord A line segment whose endpoints lie on a circle.
solid of revolution A solid formed by rotating a two-
tangent line A line that lies in the plane of a circle and that intersects the
dimensional figure about a line.
circle at exactly one point.
section The intersection of a solid and a plane.
point of tangency The point of intersection of a tangent line and a circle.
Types of Solids:
congruent circles Two or more circles with the same radius.
Prism
Pyramid
concentric circles Circles that share the same center.
Cylinder
Cone
arc Two points on a circle and the continuous part of the circle between
them.
Sphere
semicircle An arc of a circle whose endpoints are the endpoints of a
Hemisphere
diameter.
minor arc An arc of a circle that is less than a semicircle.
major arc An arc of a circle that is greater than a semicircle.
arc measure The measure of the central angle that intercepts an arc,
measured in degrees.
central angle An angle whose vertex is the center of a circle and whose
sides pass through the endpoints of an arc.
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