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Math 7 - Ch. 7

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