 | Term | Definition |
| |
Perimeter |
the distance around the outside of any polygon, by adding all the lengths of its sides. |
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Circumference |
the measurement of the distance around a circle. |
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Diameter |
is any line segment through the center that connects two points on a circle. |
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Circle |
a closed plane figure made up of all the points the same distance from the center |
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Radius |
is any line segment that connects the center to a point on a circle. |
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Chord |
any line segment that connects two points on a circle. |
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Central angle |
is an angle whose vertex is the center. |
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Angle |
is formed by two rays that have the same endpoint. |
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Vertex |
the common endpoint of an angle. |
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Sides |
the rays are the sides of the angle. |
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Acute angle |
has a measure between 0 and 90 degrees. |
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Right angle |
has a measure of 90 degrees. |
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Obtuse angle |
has a measure between 90 and 180 degrees. |
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Straight angle |
has a measure of 180 degrees. |
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Point |
is an exact location in space. |
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Line |
is a straight path of points that goes on forever in two directions. |
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Line segment |
is part of a line. It has two endpoints. Its MIDPOINT is halfway between the endpoints. |
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Ray |
is part of a line. It has one endpoint and extends forever in only one direction. |
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Plane |
is an endless flat surface. |
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Parallel lines |
never cross and stay the same distance apart. |
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Intersecting lines |
pass through the same point. |
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Perpendicular lines |
are intersecting lines that form square corners. |
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Polygon |
is a closed plane figure made up of line segments. The names of common polygons tell how many sides the polygon has. |
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Regular polygon |
has sides of equal length and angles of equal measure. |
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Triangle |
has 3 sides. |
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Quadrilateral |
has 4 sides. |
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Pentagon |
has 5 sides. |
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Hexagon |
has 6 sides. |
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Octogon |
has 8 sides. |
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Parallelogram |
a quadrilateral with both pairs of opposite sides parallel and equal in length. |
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Trapezoid |
a quadrilateral with only one pair of parallel sides. |
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Rectangle |
a parallelogram with 4 right angles. |
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Rhombus |
a parallelogram with all sides the same length. |
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Square |
a rectangle with all sides the same length |
| Add or remove terms from this set |
