Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Geometry - Chapter 1
Chapter 1 Vocabulary
| Term | Definition |
|---|---|
| Acute Angle | An angle that measures greater than 0 and less than 90 degrees |
| Adjacent Angle | Two angles in the same place with a common vertex and a common side, but no comm on interior points. |
| Angle | A figure formed by two rays with a common endpoint |
| Angle Bisector | a ray that divides an angle into two congruent angles |
| Area | The number of nonoverlapping unit squares of a given size that will exactly cover the interior of a plane |
| Base | Any side of a triangle |
| Between | given three points A,B, and C, B is between A and C if and only if all three of the points lie on the same line, and AB+BC=AC |
| Bisect | to divide into two congruent parts |
| Circumference | the distance around a circle |
| Collinear | points that lie on the same line |
| Complementary angles | Two angles whose measures have a sum of 90 degrees |
| Congruent angles | angles that have the same measure |
| Congruent segments | two segments that have the same length |
| Construction | a method of creating a figure that is considered to be mathematically precise |
| Coordinate | a number used to identify the location of a point |
| Coordinate plane | a plane that is divided into four regions by a horizontal line is called the x-axis and a vertical line called y-axis |
| Coplanar | points that lie in the same plane |
| Degree | a unit of angle measure |
| Diameter | a segment that passes through the center of a circle and whose endpoints are on the circle, or the length of such a segment |
| Distance | the absolute value of the difference of the coordinates of two points |
| Endpoint | a point at an end of a segment or the starting point of a ray |
| Exterior of an angle | the set of all points outside an angle |
| Height | a segment from a vertex that forms a right angle with a line containing the base |
| Hypotenuse | the side opposite the right angle in a right triangle |
| Image | the shape that results from a transformation of a figure |
| Interior of an angle | the set of all points between the sides of an angle |
| Leg | one of the two sides of the right triangle that form the right angle |
| Length | the distance between the two endpoints of a segment |
| Line | a straight path that has no thickness and extends forever |
| Linear pair | a pair of adjacent angles whose noncommon sides are opposite rays |
| Measure | the use of units to find a size or quality |
| Midpoint | the point that divides a segment into two congruent segments |
| Obtuse angle | an angle that measures greater than 90 degrees and less than 180 degrees |
| Opposite rays | two rays that have a common endpoint and form a line |
| Perimeter | the sum of the side lengths of a closed plane figure |
| Pi | the ratio of the circumference of a circle to its diameter, denoted by the Greek letter n |
| Plane | a flat surface that has no thickness and extends forever |
| Point | a location that has no size |
| Postulate | a statement that is accepted as true without proof, also called an axiom |
| Preimage | the original figure in a transformation |
| Radius | a segment whose endpoint are the center of a circle and a point on the circle, or the distance from the center of a circle to any point on the circle |
| Ray | a part of a line that starts at an endpoint and extends forever in one direction |
| Reflection | a transformation across a line |
| Right Angle | an angle that measures 90 degrees |
| Rotation | a transformation about a point P, such that each point and its image are the same distance from P |
| Segment | a part of a line consisting of two endpoints and all points between them |
| Segment bisector | a line, ray, or segment that divides a segment into two congruent segments |
| Straight Angle | an angle formed by two opposite rays that measures 180 degrees |
| Supplementary Angle | two angles whose measures have a sum of 180 degrees |
| Transformation | a change in the position, size or shape of a figure |
| Translation | a transformation in which all the points of a figure move the same distance in the same direction |
| Undefined term | a basic figure that is not defined in terms of other figures |
| Vertex | the common endpoint of the sides of an angle |
| Vertical Angles | the nonadjacent angles formed by two intersecting lines. |
Created by:
ashoup
Popular Math sets