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### 36 Cards in this Set

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• Back
 equilateral triangle triangle with all three sides equal in length; all angles have the same measure faces flat surface on a 3-dimensional shape pentagon polygon with 5 sides flips=reflections The flipping of a figure over a line so that its image is the mirror image of the original intersecting lines lines which meet or cross one another perimeter distance around a closed 2-dimensional shape heptagon polygon with 7 sides hexagon polygon with 6 sides edges line segments where two faces of a polyhedron meet right angle angle measuring 90 cylinder 3-dimensional shape with two circular bases that are parallel and congruent and are connected by a curved surface; a can is a cylinder parallel never meeting and always the same distance apart point an exact location in space; the center of a circle is a point irregular polygon polygon with sides of different lengths or angles of different measures congruent having exactly same shape and size obtuse angle angle measuring greater than 90 and less than 180 perpendicular meeting at right angles polygon a closed, 2-dimensional figure that is made up of line segments joined end to end quadrilateral polygon that has 4 sides similar exactly the same shape but not necessarily the same size angle figure that is formed by two rays or two line segments with a common endpoint acute angle angle measuring greater than 0 and less than 90 radius/radii line segment from the center of a circle to any point on the circle; also, the length of such a line segment cube a polyhedron with 6 square faces; has 8 vertices and 12 edges parallelogram quadrilateral with 2 pairs of paralles sides; opposite sides of a parallelogram are congruent circumference the distance around a circle or a sphere; the perimeter of a circle isosceles triangle triangle with at least two sides that are the same length; at least two angles have same measures area the amount of surface inside a closed boundary; measured in square units rectangle parallelgram with 4 right angles nonagon polygon with 9 sides degrees unit of measure for angles based on dividing a circle into 360 equal parts; also unit of measure for temperature regular polygon polygon whose sides are all the same length and whose angles are all equal cone a 3-dimensional shape that has a circular base, a curved surface, and one vertex which is called the apex. rectangular prism a prism whose faces (including bases) are all rectangles octagon polygon with 8 sides cubic units a unit used in measuring volume, such as cubic centimeters or cubic feet.