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Ch. 7 Vocabulary
Math 7 - Ch. 7
| Question | Answer |
|---|---|
| Circle | The set of all points in a plane that are the same distance from a given point |
| Skew Lines | Lines that lie in different planes that are neither parallel nor intersecting |
| Line | A straight path that extends without end in opposite directions |
| Plane | A flat surface that extends forever |
| Arc | A part of a circle named by its endpoints |
| Vertex | The point where two sides intersect |
| Perpendicular Lines | Line the intersect to form right angles |
| Ray | A part of a line that starts at one endpoint and extends forever |
| Acute angle | An angle that measure less than 90 degrees |
| Radius | Line segment with one endpoint at the center of a circle, the other endpoint on the circle |
| Congruent | Having the same size and shape |
| Line Segment | A part of a line between two endpoints |
| Complementary Angles | Two angles whose measures add to 90 degrees |
| Straight Angle | An angle that measure 180 degrees |
| Sector | A region enclosed by two radii and the arc joining their endpoints |
| Angle | A figure formed by 2 rays witha common endpoint |
| Vertical Angles | A pair of opposite congruent angles formed by intersecting lines |
| Obtuse Angle | An angle whose measure is great than 90 degrees but less than 180 degrees |
| Diameter | A line segment that passes through the center of a circle and has endpoints on the circle |
| Point | An exact location in space |
| Supplementary Angles | Two angles whose measures have a sum of 180 degrees |
| Center of a Circle | The point inside a circle that is the same distance from all points on the circle |
| Right Angle | An angle that measures 90 degrees |
| Parallel Lines | Lines in a plane that do not intersect |
| Chord | A line segment with endpoints on a circle |
| Transversal | A line that intersects two or more lines |
| Central Angle | An angle with its vertex at the center of a circle |
| Polygon | A closed figure formed by 3 or more line segments |
| Side | A line bounding a geometric figure |
| vertex of a polygon | The point where 2 sides of a polygon intersect |
| Regular Polygon | A polygon with congruent sides and angles |
| Scalene Triangle | A triangle with no congruent sides |
| Isosceles Triangle | A triangle with at least two congruent sides |
| Equilateral Triangle | A triangle with three congruent sides |
| Acute Triangle | A triangle with all three angles measuring less than 90 degrees |
| Obtuse Triangle | A triangle containing one obtuse angle |
| Right triangle | A triangle containing a right angle |
| Parallelogram | A quadrilateral with 2 pairs of parallel sides |
| Rhombus | A parallelogram with all sides congruent |
| Rectangle | A parallelogram with 4 right angles |
| Square | A rectangle with 4 congruent sides |
| Trapezoid | A quadrilateral with exactly one pair of parallel sides |
| Kite | A quadrilateral with 2 pairs of adjacent congruent sides |
| Diagonal | A line segment that connects two non-adjacent vertices of a polygon |
| Side-side-side Rule | A rule stating that is three sides of one triangle are congruent to three sides of another triangle, the triangles are congruent |
| Transformation | A change in size or position of a figure |
| Image | A figure resulting from a transformation |
| Translation | A movement (slide) of a figure along a straight line |
| Rotation | A transformation in which the figure is turned around a point |
| Reflection | A transformation of a figure that flips the figure across a line |
| Line of Reflection | A line that a figure is flipped across to create a mirror image of the original figure |
| Line Symmetry | One-half of a figure is a mirror-image of the other half |
| Line of Symmetry | The imaginary "mirror" in line symmetry |
| Asymmetry | Not identical on either side of a central line; not symmetrical |
| Rotational Symmetry | A figure has rotational symmetry if it can be rotated less than 360 degrees around a central point and coincide with the original figure |
| Center of Rotation | The point about which a figure is rotated |
Created by:
unverferth
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