Foundations for Geometry
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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acute angle | An angle that measures less than 90 degrees.
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acute triangle | A triangle with all angles measuring less than 90 degrees.
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angle | A figure formed by two rays with a common vertex.
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center of rotation | The point about which a figure is rotated.
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complementary angles | Two angles whose measures add up to 90 degrees.
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congruent | Having the same size and shape.
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correspondence | The relationship between two or more objects that are matched.
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equilateral triangle | A triangle with three congruent sides.
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image | A figure resulting from a transformation.
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isosceles triangle | A triangle with at least two congruent sides.
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line | A straight path that extends without end in opposite directions.
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line of symmetry | the imaginary "mirror" in line symmetry.
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line symmetry | One half of a figure is a mirror image of the other half.
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obtuse angle | An angle whose measure is greater that 90 degrees but less than 180 degrees.
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obtuse triangle | A triangle containing one obtuse angle.
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parallel lines | Lines in a plane that do not intersect.
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parallelogram | A quadrilateral with two pairs of parallel sides.
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perpendicular lines | Lines that intersect to form right angles.
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plane | A flat surface that extends forever.
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point | An exact location in space.
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polygon | A close plane figure formed by three or more line segments that intersect only at their endpoints.
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ray | A part of a line that starts at one endpoint and extends forever.
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rectangle | A parallelogram with four right angles.
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reflection | A transformation of a figure that flips the figure across a line.
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regular polygon | A polygon with congruent sides and angles.
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regular tessellation | A regular polygon is repeated to fill a plane.
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rhombus | A parallelogram with all sides congruent.
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right angle | An angle that measures 90 degrees.
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right triangle | A triangle containing a right angle.
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rise | The vertical change when,the slope of a line is expressed as the ratio rise/run, or "rise over run".
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rotation | A transformation in which a figure is turned around a point.
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rotational symmetry | When a figure can be rotated less than 360 degrees around a central point and coincides with the original figure.
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run | The horizontal change when,the slope of a line is expressed as the ratio rise/run, or "rise over run".
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scalene triangle | A triangle with no congruent sides.
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segment | A part of a line between two endpoints.
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slope | A measure of the steepness of a line on a graph; the rise divided by the run.
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square | A rectangle with four congruent sides.
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supplementary angles | Two angles whose measures have a sum of 180 degrees.
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tessellation | A repeating pattern of plane figures that completely cover a plane with no gaps or overlaps.
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transformation | A change in the size or position of a figure.
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translation | A movement (slide) of a figure along a straight line.
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transversal | A line that intersects two or more lines.
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trapezoid | A quadrilateral with exactly one pair of parallel sides.
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Triangle Sum Theorem | The measures of the angles in a triangle add up to 180 degrees.
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vertical angles | A pair of opposite congruent angles formed by intersecting lines.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
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Created by:
bookannelid
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