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25 Cards in this Set
- Front
- Back
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the answer to an addition problem
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sum
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the answer to a subtraction problem
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difference
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an answer close to the exact answer done by rounding
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estimate
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a straight line joined by two end points
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line segment
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a straight path that goes on forever in opposite directions
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line
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a straight path that starts at an end point and goes on forever in the other direction
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ray
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a figure formed by two rays or two line segments that share an endpoint
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angle
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a polygon with three sides
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triangle
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a polygon with four sides
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quadrilateral
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the point where the sides of an angle or the sides of a polygon meet
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vertex
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two lines that stay the same distance apart and never meet
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parallel lines
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two lines that cross or meet
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intersecting lines
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two lines that cross or meet at a right angle
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perpendicular lines
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a figure that is made up of three or more line segments joined end to end to make one closed path
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polygon
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a polygon with five sides
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pentagon
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a polygon where all sides are pushed outward
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convex polygon
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a polygon where at least one vertex is pushed inward
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nonconvex or concave polygon
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a polygon with six sides
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hexagon
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a polygon with seven sides
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heptagon
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a polygon with eight sides
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octagon
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a polygon with nine sides
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nonagon
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the inside of a closed polygon
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interior
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a polygon whose sides are all the same length and whose interior angles are all equal
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regular polygon
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a triangle with all three sides equal in length. all three angles have all the same measurement
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equilateral triangle
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a mathematical tool used to construct circles
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compass
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