hpatss Geometry Ch 1
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51 terms
Terms | Definitions |
|---|---|
 line | a straight, continuous arrangement ofg infinitely many points |
| plane | a flat surface that has no thickness and extends infinitely along its length and width |
| point | represented by a dot ...it has no size, only location |
| collinear | on the same line |
| coplanar | on the same plane |
| line segment | consists of two endpoints of the segment and all of the points between them that are collinear with the two points |
| end points | the two points that define the limits of a line segment |
| congruent | two geometric structures that have the same measure or length |
| midpoint | a point on the segment that is the same distance from both endpoints |
| bisects | divides the segment into two congruent segments or an angle into two congruent angles |
| ray | begins at a point and extends in a straight line...aka a half line |
| angle | formed by two rays that share a common endpoint called a vertex |
| vertex | common endpoint of two rays that form an angle |
| measurement of an angle | the smallest amount of rotation about the vertex from one ray to the other...measured in degrees |
| parallel lines | lines in the same plane that never intersect each other |
| perpendicular lines | lines that intersect with each other at 90 degrees |
| skew lines | lines that are noncoplanar and also do not intersect |
| right angle | an angle that measures 90 degrees |
| acute angle | an angle that measures less than 90 degrees |
| obtuse angle | an angle that measures more than 90 degrees |
| pair of vertical angles | formed by two intersecting lines that share a vertex but no common sides |
| linear pair of angles | two angles that share a vertex and a common side and their non-common sides form a line |
| complementary angles | two angles whose measurements add up to 90 degrees |
| supplementary angles | two angles whose measurements add up to 180 degrees |
| polygon | a closed figure in a plane formed by connecting line segments endpoint to endpoint with each segment intersecting exactly two others |
| polygon diagonal | a line segment that connects two nonconsecutive vertices |
| convex polygon | no diagonal is outside the polygon |
| concave polygon | at least one diagonal is outside the polygon |
| equilateral polygon | all sides of the polygon are equal length |
| equiangular polygon | all angles of the polygon are equal measures |
| reguylar polygon | a polygon that is both equilateral & equiangular |
| right triangle | a triangle that has one right angle |
| acute triangle | a triangle that has three acute angles |
| obtuse triangle | a triangle with one obtuse angle |
| scalene triangle | a triangle with no congruent sides |
| equilateral triangle | a triangle with three congruent sides |
| isosceles triangle | a triangle with 2 congruent sides |
| trapezoid | a quadrilateral with exactly one pair of parallel sides |
| kite | a quadrilateral with two distinct pairs of consecutive congruent sides |
| parallelgram | a quadrilateral with two pairs of parallel sides |
| rhombus | an equilateral parallelogram |
| rectangle | a parallelogram with four congruent angles |
| square | an equilateral rectangle |
| circle | the set of all points in a plane at a given distance from a center point in the plane |
| radius | a segment from the center to a point on the edge of the circle |
| diameter | a segment containing the center with endpoints on the circle |
| arc of a circle | two points on the circle and the continuous part of the circle between the two points |
| semicircle | an arc of a circle whose endpoints are the endpoints of a diameter |
| minor arc | arc of a circle that is smaller than a semicircle |
| major arc | arc of a circle that is larger than a semicircle |
| arc measure | determined by measuring the central angle (vertex is the center point of the circle) |
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