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# dcrawf geometry

### shapes and designs unit vocabulary

Has a measure of 90°. right angle
Lines in a plane that never meet. parallel lines
A shape with this has two halves that are mirror images of each other. reflection symmetry
Two lines that intersect to form right angles. perpendicular lines
A polygon with at least two sides with different lengths or two angles with different measures. irregular polygon
The angle inside a polygon formed by two adjacent sides of the polygon. interior angle
An angle with a vertex at the center of a circle. central angle
A line segment connecting two nonadjacent vertices of a polygon. diagonal
A polygon in which all the sides are the same length. regular polygon
An angle outside the polygon formed by extending a side of the polygon. exterior angle
A line that intersects two or more lines. transversal
An angle that measures 180°. straight angle
A line such that if a shape is folded over it, the two halves of the shape match perfectly. line of symmetry
An angle whose measure is less than 90°. acute angle
A closed shape formed by line segments. polygon
An angle whose measure is greater than 90° and less than 180°. obtuse angle
A parallelogram with all right angles, including squares which are a special type. rectangle
A quadrilateral with opposite sides parallel. Both pairs of opposite angles are also equal. parallelogram
A triangle with no side lengths equal. scalene triangle
The point where two sides of a polygon or two rays meet. vertex
Covering a flat surface with shapes that fit together without any gaps or overlaps. tiling
A shape can be turned less than 360° about its center to a position where it looks exactly as it did before it was turned. rotation symmetry
Two points of a line and all the points between these two points. line segment
A triangle with two sides the same length. isosceles triangle
A triangle with all sides and all angles equal to each other. equilateral triangle
The sum of all the measures of the interior angles of a polygon. angle sum
Created by: dcrawf