Vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Geometry | the study of points, lines, angles, surfaces, and solids.
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| Point | a location in space
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| line | a collection of points that extend forever in the same direction
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| line segment | part of a line, 2 endpoints
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| ray | a line that has a beginning point but no end
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| angle | two rays with the same endpoint
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| vertex | the point where two rays meet
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| plane | a flat surface that extends forever in all directions
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| parallel lines | lines that are always the same distance apart
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| intersecting lines | lines that cross in the same plane
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| perpendicular lines | intersecting lines that cross and form four right angles
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| acute angle | less than 90 degress
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| right angle | 90 degrees
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| obtuse angle | greater than 90 but less than 180 degrees
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| straight angle | 180 degrees
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| reflex angle | between 180 and 360 degrees
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| supplementary angles | 2 angles that measure 180 degrees
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| complementary angles | 2 angles that measure 90 degress
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| polygon | a closed plane figure with 3 or more sides
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| triangle | 3 sides
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| quadrilateral | 4 sides
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| pentagon | 5 sides
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| hexagon | 6 sides
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| heptagon | 7 sides
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| octagon | 8 sides
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| nonagon | 9 sides
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| decagon | 10 sides
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| dodecagon | 12 sides
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| Right Triangle | one 90 degree angle
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| Obtuse Triangle | one angle more than 90 degrees
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| Acute Triangle | all angles are less than 90 degrees
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| Scalene Triangle | no sides equal and no equal angles
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| Isosceles Triangle | 2 sides equaland 2 equal angles
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| Equilateral Triangle | 3 sides equal and 3 angles that are 60 degrees each
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| Square | 4 equal sides and 4 right angles
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| Rectangle | 4 right angles and the opposite sides are equal
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| Rhombus | 4 equal sides and the opposite angles are equal
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| Parallelogram | 2 pairs of equal and parallel sides
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| Trapezoid | one pair of parallel sides and one pair of sides that are not parallel
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| sum of the measure of the interior angles of triangle | 180 degrees
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| Perimeter | shortest distance around the outside of a polygon
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| Perimeter Formula | add up all the sides
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| Area | number of square units needed to cover a surface
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| Altitude | height of a polygon
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| Area of a Square | base x height
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| Area of a Rectangle | base x height
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| Area of a Parallelogram | base x height
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| Area of a Triangle | 1/2 base x height
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| Area of a Trapezoid | 1/2 x h x(base 1 + base 2)
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
ppearson
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