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Geometry Vocab. =(
Momo's study guide for geometry vocab. quiz
29
Mathematics
7th Grade
03/11/2009

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Term
Obtuse Angle
Definition
Angles with measure greater than 90 degrees
Term
Acute Angle
Definition
Angles with measure less than 90 degrees
Term
Parallel Lines
Definition
Lines that lie in the same plane and do not intersect
Term
Perpendicular Lines
Definition
Lines that intersect to form right angles
Term
Angle Bisector
Definition
A ray that divides given angle into 2 congruent angles each half the size of the given angle
Term
Line
Definition
A series of points that extends in 2 directions without end
Term
Ray
Definition
Part of a line that has one end point and goes in one direction without end
Term
Segment
Definition
A segment is part of a line that has 2 endpoints
Term
Equilateral Triangle
Definition
A triangle with 3 congruent sides
Term
Isosceles Triangle
Definition
A triangle with 2 congruent sides
Term
Scalene Triangle
Definition
A triangle with no congruent sides
Term
Compass
Definition
Geometric tool used to draw circles and arcs
Term
Protractor
Definition
Geometric tool used to measure angles
Term
Congruent
Definition
The same measure/symbol
Term
Similar
Definition
Corresponding angles with equal measures and corresponding sides with proportional lengths/Symbol: ~
Term
Vertex
Definition
Point where 2 lines come together to create an angle
Term
Plane
Definition
A flat surface that has no thickness and continues without end in all directions
Term
Intersect
Definition
Where 2 lines cross
Term
Supplementary Angles
Definition
2 angles whose measure together equal 180 degrees
Term
Complimentary Angles
Definition
2 angles whose measures together equal 90 degrees
Term
Regular Polygon
Definition
A closed plane figure with at least 3 sides and all of its sides and angles congruent
Term
Square
Definition
A parallelogram with 4 right angles and 4 congruent sides
Term
Rectangle
Definition
Parallelogram with 4 right angles
Term
Parallelogram
Definition
A quadrilateral with both pairs of opposite sides parallel
Term
Rhombus
Definition
Parallelogram with four congruent sides
Term
Trapezoid
Definition
A quadrilateral with exactly 1 pair of parallel sides
Term
Quadrilateral
Definition
A polygon with 4 sides
Term
Radius
Definition
A segment that has 1 endpoint at the center of the circle and the other endpoint on the circle
Term
Diameter
Definition
A segment that passes through the center of the circle
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