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Geometry Glossary 1

Ms. Prunty

First list of geometry words

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Across
2.formed by two rays with a common endpoint.
5.in a right triangle, the side opposite the 90° angle.
8.an angle greater than 90° but less than 180°
9.next to each other
10.shape having only length and width (two dimensional).
12.a line crossing two or more parallel or nonparallel lines in a plane.
13.the point at which two rays meet and form an angle, or the point at which two sides meet in a polygon.
15.in a triangle, a line segment drawn from a vertex to the midpoint of the opposite side.
16.angles formed inside the shape or within two parallel lines.
17.a theorem that applies to right triangles. The sum of the squares of a right triangle's two legs equals the square of the hypotenuse (a[2] + b[2] = c[2]).
18.two or more lines, always the same distance apart. Parallel lines never meet.
19.two lines that intersect at right angles.
21.the total distance around the outside of any polygon. The total length of all the sides.
22.an angle equal to 180°. Often called a line.
26.the halfway point of a line segment, equidistant from each endpoint.
27.altitude. From the highest point, a perpendicular drawn to the base.
28.capacity to hold, measured in cubic units. (length x width x height).
29.an angle whose measure is equal to 90°.
30.a triangle containing an obtuse angle
31.two angles the sum of which measures 180°.
32.divides into two equal parts.
33.a triangle having none of its sides equal (or angles equal).
34.a basic element of geometry, a location. If two lines intersect, they do so at a point.
35.a unit of measurement of an angle.
36.a triangle containing a 90° angle.
39.a solid shaped like a can. Base meets side at a right angle.
43.in a trapezoid, a line segment parallel to the bases and bisecting the legs.
44.a triangle in which all three angles are equal in measure and all three sides have the same length.
45.the study of shapes and figures in two dimensions.
46.the opposite angles formed by the intersection of two lines. Vertical angles are equal in measure.
47.angles that share a common side and a common vertex.
48.plural of vertex.
Down
1.exactly alike. Identical in shape and size.
2.an angle whose measure is less than 90°.
3.a four-sided plane closed figure having opposite sides equal and parallel. (Opposite angles are equal, and consecutive angles are supplementary.)
4.often described as the shortest distance between two points. Continues forever in both directions. (Line means straight line.)
6.often described as a flat surface.
7.a part of a line; has two endpoints
11.a triangle having two equal sides (and thus two equal angles across from those sides).
14.a triangle containing all acute angles.
16.a triangle having two equal sides, two equal angles, and one 90° angle. Its sides are always in the ratio 1, 1, √2.
20.in the same position. Coinciding.
23.two angles the sum of whose measures is 90°.
24.lines that meet at a point.
25.the study of shapes and figures in three dimensions: length, width, and thickness.
37.having the same shape but not the same size, in proportion.
38.a half-line. Continues forever in one direction. Has one endpoint.
40.a three-sided plane closed figure. Contains three angles the sum of whose measures is 180°.
41.in a right triangle, the two sides forming the 90° angle. In a trapezoid, the nonparallel sides.
42.the space within a shape; measured in square units.
45.a constant used in determining a circle's area or circumference. Equals approximately 3.14 or 22/7

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