Study the major geometry terms you need to know.
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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| a one dimensional figure that extends forever in both directions | line
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| part of a line, with two endpoints | segment
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| a point at the end of a line segment or ray | endpoint
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| a part of a line that has one endpoint and extends forever in the other direction | ray
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| to cross through the same point | intersect
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| two lines that cross (intersect) at right angles | perpendicular
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| two lines, segments, or rays that do not cross, no matter how far they extend | parallel
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| two rays with the same endpoint | angle
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| each of the rays forming an angle | side
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| the common endpoint of two rays forming an angle | vertex
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| a unit of angle measure ( 1/360 of a complete circle), represented with (°) | degree
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| a tool that measures angles | protractor
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| an angle that measures 90°, it forms a perfect corner | right angle
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| an angle smaller than a right angle | acute angle
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| an angle greater than a right angle but smaller than a straight angle (between 90° and 180°) | obtuse angle
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| an angle formed by two rays pointing in opposite directions (180° angle) | straight angle
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| two angles whose measures add up to 90°; they make a Corner | complimentary angles
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| two angles whose measures add up to 180°; they make a Straight line | supplementary angles
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| angles with the exact same measure | congruent angles
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| a closed figure made of line segments | polygon
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| a closed figure made from three line segments | triangle
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| The sum of the angles in a triangle must equal | 180 degrees
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| a triangle with three acute angles (all angles < 90°) | acute triangle
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| a triangle with an obtuse angle (one angle > 90°) | obtuse angle
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| a triangle with a right angle (one angle=90°) | right angle
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| the longest side of a right triangle (the side opposite the right angle) | hypotenuse
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| either of the two sides in a right triangle that form the right angle | leg (of a right triangle)
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| a triangle with three sides of the same length | equilateral triangle
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| a triangle with at least two sides of the same length | isosceles triangle
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| a triangle with no sides of equal length | scalene triangle
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| a polygon whose sides and angles have equal measures | regular polygon
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| a polygon that does NOT have all sides and angles equal | irregular polygon
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| two polygons with the exact same shape but of different size | congruent polygons
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| a closed figure made from 4 line segments | quadrilateral
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| a closed figure made from 5 line segments | pentagon
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| a closed figure made from 6 line segments | hexagon
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| a closed figure made from 7 line segments | heptagon
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| a closed figure made from 8 line segments | octagon
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| a closed figure made from 9 line segments | nonagon
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| a closed figure made from 10 line segments | decagon
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| The sum of the angles in a quadrilateral must equal | 360 degrees
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| a quadrilateral with exactly two sides parallel | trapezoid
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| a quadrilateral whose opposite sides are parallel and equal | parallelogram
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| a parallelogram with all sides the same length (irregular quadrilateral, parallelogram) | rhombus
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| a parallelogram with opposite sides the same length and all angles measuring 90° (irregular quadrilateral, parallelogram) | rectangle
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| a parallelogram with all sides the same length and all angles measuring 90°(regular quadrilateral, parallelogram, rhombus) | square
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| a set of points that are a given distance from a center point | circle
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| the distance around the outside of a circle | circumference
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| a line segment from the center of the circle to any point on the circle | radius
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| a line segment whose endpoints are on a circle | chord
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| a line segment connecting two points on a circle and passing through the center (a special kind of chord) | diameter
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| a flat surface that extends forever in all directions | plane
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| a location on a plane with no length, no width, and no depth | point
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| a set of lines used to locate points on a plane | coordinate plane
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| vertical axis (up & down) | y-axis
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| horizontal axis (across) | x-axis
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| always read the ____-axis first | X
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| a pair of numbers used to locate a point on a coordinate plane (x,y) | ordered pair(coordinates)
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Created by:
PRO Teacher
mlasalle
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