 | Term | Definition |
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Acute angle |
an angle with a measure of less than 90° |
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Acute Triangle |
a triangle with 3 acute sides |
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Adjacent angles |
2 angles that share a vertex and a side but no points in their interiors |
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Alternate Interior Angles |
angles between 2 lines and on opposite sides of a transversal |
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Angle |
a figure formed by 2 different rays that have the same endpoint |
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Angle Bisector |
a ray dividing a given angle into two congruent angles each half the size of the given angle. |
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Angle of Depression |
an ang;e formed by a horizontal line and a line of sight below it |
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Angle of Elevation |
An angle formed by a horizontal line and a line of sight above it. |
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Area |
The number of square units a figure encloses |
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Central Angle |
an angle whose vertex is in the center of a circle. |
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Chord |
a chord of a circle is a line segment whose endpoints are on the circle. |
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Circle |
a circle is the set of all points that are equidistant from a given point, called the center. |
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Circumference |
The distance around a circle |
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Complementary Angles |
2 angles whose sum adds to 90° |
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Cone |
a figure with one circular base and one vertex |
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Congruent Angles |
Angles that have the same measure |
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Congruent Figures |
Congruent Figures are figures that have the same size and shape |
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Congruent Segments |
Segments that have the same length |
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Coordinate Plane |
The plane formed by 2 number liines that intersect at their zero points dividing the plane into 4 quadrants |
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Coordinates |
Ordered pairs that identify points on a coordinate plane. |
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Corresponding angles |
Pairs of nonadjacent angles that lie on the same side of a transversal of 2 lines and in correspondiing positions. |
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Corresponding angles of polygons |
Matching sides of similiar or congruent figures |
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Cube |
a rectangular prism with 6 congruent faces |
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Cylinder |
a figure whose bases are circular , congruent and parallel to each other. |
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Decagon |
a polygon with 10 sides |
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Diagonal of a polygon |
a segment (line) that connects 2 non consecutive vertices. |
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Diameter of a circle |
A chord passing through the center of a circle |
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Edge |
The intersection of 2 faces of a figure. |
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Equilateral Triangle |
A triangle with 3 congruelnt sides |
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face |
a surface of a figure |
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Hypotenuse |
In a right triangle, the hypotenuse is the longest side, which is opposite the right angle. |
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Isosceles triangle |
A triangle with at least 2 congruent sides |
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Legs of a right triangle |
the 2 shorter sides of the triangle |
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Line |
a series of points that extend in 2 directions without end. |
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Obtuse Angle |
An angle with a measure greater than 90° and less than 180° |
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Obtuse Triangle |
a triangle with one obtuse angle |
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Octogon |
a polygon with 8 sides |
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Parallel Lines |
lines that lie in the same plane and do not intersect.. |
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Pentagon |
a polygon with 5 sides |
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Perimeter |
The distance around a figure |
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Perpendicular Lines |
Lines that intersect ot form right angles |
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Plane |
a flat surface that has no thickness and continues without end in all directions |
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Polygon |
A closed figure with at least 3 sides |
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Point |
a location is space that has no size |
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Pyramid |
a figure with triangular fice that meet in a vertex and a base that is a polygon |
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Radius of a Circle |
a segment that has one endpoint at the center of the circle and the other endpoint on the circle. |
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Rectangle |
A parallelogram with 4 right angles |
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Right Angle |
An angle whosse measure is 90° |
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Segment |
A segemt is a part of a line with 2 endpoints |
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trapezoid |
A quadrilateral with exactly one pair of parallel sides |
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Triangle |
A polygon with 3 sides |
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Transversal |
a line that intersects 2 other points |
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