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### 19 Cards in this Set

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 ISOSCELES TRIANGLE A triangle with exactly two congruent sides. SCALENE TRIANGLE A triangle with no congruent sides. EQUILATERAL TRIANGLE A triangle with three congruent sides. HYPOTENUSE In a right triangle, the side opposite the right angle; the longest side in a right triangle. LEG In a right triangle, either of the two sides that form the right angle. FIGURATE NUMBERS Numbers that can be represented by geometric figures. TRIANGULAR NUMBERS Numbers that can be represented by triangular figures. TRAPEZOID A quadrilateral with exactly one pair of parallel sides. PARALLELOGRAM A quadrilateral whose opposite sides are parallel and congruent. RHOMBUS A parrallelogram with four congruent sides. TRANSFORMATION A movement of a figure to a new position by a translation, reflection, or rotation. TRANSLATION A movement of a figure to a new position along a straight line; a slide. REFLECTION A movement of a figure to a new position by flipping it over a line; a flip. ROTATION A movement of a figure to a new position by turning it around a vertex or point of rotation; a turn. TESSELLATION A repeating pattern of closed figures that covers a surface with no gaps and no overlaps. POLYHEDRON A solid figure with faces that are polygons. PRISM A solid figure that has two congruent, polygon-shaped bases, and other faces that are all rectangles. BASE A number used as a repeated factor. PYRAMID A solid figure with a polygon base and all other faces triangles that meet at a common vertex.