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