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49 terms

Ch. 7 Geometry Terms

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Chord
A segment inside the circle which has end points on the sides of the circle.
Hexagon
a polygon with six sides
180
Total measure the angles in every triangle.
Rhombus
A quadrilateral, parallelogram with 4 congruent sides
Scalene
A triangle with NO sides congruent
Square
A quadrilateral, parallelogram with 4 congruent sides and 4 right angles
Supplementary
Angles whose sum is 180
Straight
An angle that measures exactly 180
Obtuse
An angle that measures between 90-180
Nonagon
A polygon with 9 sides
Line
A series of points that extends indefinitely in both directions
Right
An angle that measures exactly 90
Right Triangle
A triangle with1 right angle
Regular Polygon
A polygon with ALL sides congruent and ALL angles congruent
Ray
Part of a line that extends indefinitely in ONE direction with ONE end point
Parallel lines
Lines that NEVER intersect
Rectangle
A quadrilateral, parallelogram with 4 right angles
Equilateral
A triangle with 3 congruent sides
Triangle
A polygon with 3 sides
Skew lines
Lines that are NOT in the same plane, that are NOT parallel, and do NOT intersect
Radius
A segment that connects the center of the circle to any point on the edge of the circle
Trapezoid
A quadrilateral with exactly ONE pair of parallel sides.
Diameter
A chord that crosses through the center of the circle
Complementary
Angles whose sum is 90
Decagon
A polygon with 10 sides
Congruent Sides
Sides that are equal
Congruent Angles
Angles with equal measures
Acute
An angle that measures between 0-90
Parallelogram
A quadrilateral with 2 pairs of parallel lines
Octagon
A polygon with 8 sides
Semicircle
An arc that is exactly half of the circumference; use the diameter as a side
Acute Triangle
has 3 Acute angles
Segment
Part of a line with 2 endpoints
Vertical
Angles that are across from each other; they share a vertex only
Circle
A series of points equidistant from a given point, the center; NOT A POLYGON
Heptagon
A polygon with 7 sides
Obtuse Triangle
A triangle with 1 obtuse angle
Pentagon
A polygon with 5 sides
Vertex
The intersection of two segments or rays
Plane
A flat surface that extends indefinitely in all directions
Point
Indicates a location
Quadrilateral
Any Polygon with 4 sides
Adjacent
Angles that are next to each other; share a side and vertex
Intersecting lines
lines or segments that have one point in common; they cross over each other
Angle
Formed by the intersection of two rays or segments
Irreagular Polygon
When all sides and angles are NOT congruent
Arc
Outside portion of a circle between two points
Isosceles
A triangle with 2 congruent sides
Central Angle
An angle inside the circle that has the center of the circle as a vertex of the angle