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### 38 Cards in this Set

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 area the number of square units in a polygonal region needed to cover its surface central angle an angle whose vertex is the center of the circle chord a segment whose endpoints are points on the circle circle the set of all points in a plane that are equidistant from a given point circumference the distance around a circle concentric circles circles that have a common center cone a solid with a circular base and a vertex that is not in the same plane as the base cosine a trigonometric ratio. adj/hyp cylinder a solid with congruent circular bases that lie in parallel planes diameter a chord that passes through the center of the line geometric mean for two positive numbers a and b the positive number x that a/x=x/b inscribed angle an angle whose vertex is on the circle and whose sides contain chords of the circle inscribed polygon a polygon whose vertices all lie on the circle kite a quadrilateral that has two pairs of consecutive congruent sides, but in which opposite sides are not congruent major arc the part of a circle that measures between 180* and 360* minor arc the part of a circle that measures less than 180*` parallelogram a quadrilateral with both pairs of opposite sides parallel polygon a plane figure that meets the following two conditions 1.it is formed by three or more segments called sides, such that no two sides with a common endpoint are colinear 2.each side intersects exactly tow other sides,one at each endpoint polyhedron a side that is bounded by polygons, called faces that enclose a single region of space prism a polyhedron with two congruent faces called bases that lie in parallel planes proportion an equation that equates two ratios pyramid a polyhedron in which the base is a polygon and the lateral faces are triangles with a common vertex radius the distance from the center of a circle to a point on the circle ratio the quotient a/b if a and b are two quantities that are measured in the same units rectangle a parallelogram with four right angles regular polygon a polygon that is equilateral and equilangular rhombus a parallelogram with four congruent sides right cylinder a cylinder such that the segment joining the centers of the bases are perpendicular to the bases secant a line that intersects the circle at two points sector of a circle the region bounded by two radii of a circle and their intercepted arc semicircle an arc whose endpoints of a diameter of the circle sine a trigonometric ratio. opp/hyp sphere the locus of points in a space that are a given distance from a point square a parallelogram with four congruent sides and four right angles tangent a trigonometric ratio. opp/adj tangent line a line that intersects a circle in exactly one point trapezoid a quadrilateral with exactly one pair of parallel sides vector a quantity that has both direction and magnitude