Holt Geometry Chapter 1
Terms
undefined, object
copy deck
- An angle whose measure is less than 90 degrees
- Acute Angle
- A figure formed by two rays with a common endpoint
- angle
- A ray that divides an angle into two congruent angles
- Angle bisector
- The center of a circumscribed triangle. It is the point where the three perpendicular bisectors of the sides of the triangle intersect.
- Circumcenter
- A circle that is drawn around the outside of the triangle and contains all three vertices.
- Circumscribed Circle
- Lying on the same line
- Collinear
- Two angles whose measures have a sum of 90 degrees
- Complementary angles
- Having the same size and shape
- Congruent
- A statement that is believed to be true
- Conjecture
- Lying in the same plane
- Coplanar
- The point at the end of a segment or the starting point of a ray
- Endpoint
- A shape that results from a transformation of a figure known as the preimage
- Image
- The center of an inscribed circle. The point where the three angle bisectors of a triangle intersect.
- Incenter
- A circle inside the triangle that touches each side of the triangle at one point
- Inscribed circle
- To have one or more points in common
- Intersect
- The measure of the distance from one endpoint to the other
- Length
- An undefined term in geometry that is understood to be perfectly straight, contain an infinite number of points, extend indefinitely in two directions and have no thickness
- Line
- The two angles formed by the endpoint of a ray when the endpoint falls on a line. Two adjacent angles whose noncommon sides are opposite rays
- Linear Pair
- The point that divides a segment into two congruent segments
- Midpoint
- An angle whose measure is greater than 90 degrees, but less than 180 degrees
- Obtuse angle
- Coplanar lines or any two planes in space that do not meet, no matter how far they are extended
- Parallel
- A line that is perpendicular to a segment at its midpoint
- Perpendicular bisector
- Lines that intersect to form right angles
- Perpendicular lines
- An undefined term in geometry that is understood to be a flat suface that extends indefinitely in all directions
- plane
- An undefined term in geometry that can be thought of as a dot that represents a location in a plane or space.
- Point
- A statement that is accepted as true without proof
- Postulate
- A shape that undergoes a motion or transformation
- Preimage
- A part of a line that starts at a point and extends indefinitely in one direction
- Ray
- A transformation that flips the preimage over a line
- Reflection
- An angle with a measure of 90 degrees
- Right Angle
- A transformation that does not change the size or shape of a figure
- Rigid transformation
- A transformation in which every point of the preimage is rotated by a given angle around a point
- Rotation
- A part of a line that begins at a point and ends at another
- Segment
- A line that divides a segment into two congruent segments
- Segment Bisector
- Two angles whose measures have a sum of 180 degrees
- Supplementary Angles
- A transformation in which every point of the preimage moves in the same direction by the same distance to form the image
- Translation