# Geometry Chapter 1

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 Author: Minhs2 ID: 168449 Filename: Geometry Chapter 1 Updated: 2012-09-04 19:56:52 Tags: Geometry chapter Minhs2 Holt California Folders: Description: Geometry Chapter 1 California Holt Show Answers:

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1. Acute Angle
An angle that measures less than 90° and greater than 0°
Two angles with the same plane which share a common vertex and a common side, but no interior points
3. Angle
A figure formed by two rays with a common endpoint.
4. Angle Bisector
Ray that divides an angle into 2 congruent halves
5. Area
The number of nonoverlapping squares of a given size that will exactly cover the interior of a plane figure
6. Base
Any side of a triangle
7. Between
Given point B beetween A and C, the measure od AB+BC=AC
8. Bisect
To cut into two congruent parts
9. Circumference
The distance around the the outside of a circle
10. Collinear
Points that lie on the same line
11. Complementary Angles
Two angles whose measurements have a sum of 90°
12. Congruent Angles
Angles that have the exact same measure
13. Congruent Segments
2 segments that have the exact same length
14. Construction
A precise way of creating a figure which use the straightedge and the compass, geometry software, or paper folding
15. Coordinate
A coordinate tells the location of a point on a line. 2 coordinates tells the location of a point on the plane. 3 coordinates tells the location of a point  in space.
16. Coordinate Plane
The plane that is divided into 4 regions by a horizontal line called the x-axis and a vertical line called the y-axis
17. Coplanar
Points that lie on the same plane
18. Degree
A unit of angle measurement equal to  of a complete circle
19. Diameter
A line segment that has endpoints on the circle and passes through the center of the circle or the legth of that segment
20. Distance
The absolute value of the difference of the coordinates of the points
21. Endpoint
A point at the end of a segment or the starting point of a ray
22. Exterior of an Angle
The set of all points outside an angle
23. Interior of an Angle
The set of all points between the sides of an angle
24. Height
The segment from a vertex that forms a right angle with a line containing the base
25. Hypotenuse
The side opposite of the right angle in a right triangle
26. Image
A shape that results from transformation of a preimage
27. Leg
1 of the 2 sides that form the right angle in a right triangle
28. Length
The distance between 2 endpoints of a segment
29. Line
An undefined term in geometry and is a straight path that has no thickness and extends forever
30. Linear Pair
A pair of adjacent angles whose noncommon sides are opposite rays
31. Measure
A unit of length or degree
32. Midpoint
The point that divides a segment into 2 congruent segments
33. Obtuse Angle
An angle that measures greater than 90° and less than 180°
34. Opposite Rays
Two rays that have a common endpoint and form a line
35. Perimeter
The sum of the side lengths of a closed plane figure
36. Pi
The ratio of the circumference of a circle to its diameter
37. Plane
An undefined term in geometry and is a flat surface that has no thickness and extends forever
38. Point
An undefined term in geometry that names a location and has no size
39. Postulate
A statement that is accepted to be true without proof
40. Preimage
The original  figure in a transformation
A line segment whose endpoints are the center of a circle and a point on the circle and also means the length of this segment
42. Ray
A part of a line starting at an endpoint and extends forever in one direction
43. Reflection
A transformation across a line of reflection, so that the line of reflection is the perpendicular bisector of each segment joining each point and its image
44. Right Angle
An angle that measues 90°
45. Rotation
A transformation in which a plane figure turns around a fixed center of rotation, so that each point and its image ate the same distance away from the center of rotation
46. Segment
A part of a line consisting of 2 endpoints and all the points between them
47. Segment Bisector
A line, a ray, or a segment that divides segment into two congruent segments
48. Straight Angle
An angle that measures 180°
49. Supplementary Angles
Two angles whose measures have a sum of 180°
50. Transformations
A change in the position, size, or shape of a figure or graph
51. Translation
A transformation that shifts ot slides every point of a figure or graph the same distance in the same direction
52. Vertex
The common endpoint of the rays of an angle
53. Vertical Angles
The nonadjacent angles formed by 2 intersecting lines
54. Undefined Term
A basic figure that is not defined in terms of other figures
55. Points, Lines, and Planes Postulates
1. Through 2 points there is exactly 1 line

2. Through any 3 noncolliner points there is exactly one plane containing them

3. If 2 points lie in a plane, then the line containing those points lie in the plane
56. Intersection of Lines and Planes Postulates
1. If 2 lines intersect, then they intersect in exactly 1 point

2. If 2 planes intersect, then they intersect in exactly one line
57. Ruler Postulate
The points on a line can be put into a one-to-one correspendence with the real numbers