Right triangle

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Right triangle

• A triangle with ONE angle measuring exactly 90

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Plane

• A flat surface in space, with no thickness, that
  continues endlessly in all directions

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angle

• A figure formed from two rays with a common
  endpoint

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Obtuse angle

• An angle with a measure greater than 90 but less
  than 180

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Right angle

• An angle with a measure of exactly 90

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complementary

• A pair of angles whose measures have a sum of 90

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Point

• an exact location in space

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Acute angle

• An angle with a measure less than 90

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Ray

• Part of a line that has one endpoint and travels
  endlessly in only one direction

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supplementary

• A pair of angles whose measures have a sum of 180

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Line

• A straight path of points that travels endlessly
  in opposite directions

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Segment

• Part of a line that is two endpoints and all of
  the points that lie between them

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triangle

• A figure formed when 3 points, not on the same
  line, are joined by segments

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circle

• A set of points in the same plane that are all
  the same distance from a given point

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Acute triangle

• A triangle with all three angles measuring less
  than 90

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Heptagon

• A polygon with 7 sides

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Straight angle

• An angle with a measure of exactly 180

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Parallel lines

• Two lines in the same plane that never intersect

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Isosceles triangle

• A triangle with at least two sides equal in length

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perpendicular

• Two lines rays or segments that meet or cross to
  form right angles

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congruent

• Two figures that are the same size and the same
  shape

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Polygon

• A closed plane figure made by joining 3 or more
  segments that do not cross

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Hexagon

• A polygon with 6 sides

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Trapezoid

• A quadrilateral with ONE pair of parallel sides

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Equilateral triangle

• A triangle with ALL 3 sides equal in length

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Octagon

• A polygon with 8 sides

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Pentagon

• A polygon with 5 sides

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diameter

• A segment that goes from a point on the circle,
  through the center, to another point on the circle

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Parallelogram

• A quadrilateral with BOTH pair of opposite sides
  parallel and congruent

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Central angle

• An angle whose vertex is the center of the circle

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quadrilateral

• A polygon with 4 sides

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Decagon

• A polygon with 10 sides

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chord

• A segment joining 2 points that lie on the same
  circle

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rhombus

• A parallelogram with 4 congruent (equal) sides

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Scalene triangle

• A triangle with all three sides different in
  length

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Nonagon

• A polygon with 9 sides

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Regular polygon

• all of its sides have the same length and all of
  its angles have the same measure

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Obtuse triangle

• A triangle with ONE angle measuring greater than
  90 but less than 180

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Rectangle

• A parallelogram with 4 right angles

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square

• A parallelogram with 4 right angles and 4
  congruent (equal) sides

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radius

• A segment joining the center of a circle to a
  point ON the circle

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arc

• Part of a circle