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Glossary Term inscribed angle Definition An angle whose vertex lies on a circle and whose sides contain chords of the circle. In the figure, ∠RST is inscribed in circle P. inscribed polygon A polygon in which every vertex of the polygon lies on the circle. integers The set of whole numbers and their opposites {…, -2, -1, 0, 1, 2, …}. The point at which a line or curve cuts across another line, curve, or surface. In the figure, transversal t intersects lines l and m. ∠3, ∠4, ∠5, and ∠6 are interior angles. intercept interior angles interior of an angle interpolation interquartile range intersecting lines intersection interval inverse inverse of a relation inverse functions inverse operations inverse variation All points between the two sides of an angle. Predicting an x-value between the least and greatest values of the set. The difference between the upper and lower quartiles representing the middle half of the data in the set. Lines that are coplanar and have exactly one point in common. The set of elements common to two or more sets as in compound inequalities and Venn diagrams. On a scale, the difference between the greatest and least values in each category. The statement formed by negating both the hypothesis and conclusion of a conditional statement. The inverse of any relation is obtained by switching the coordinates in each ordered pair. Two functions f and g are inverse functions if and only if both of their compositions are the identity function. [ f o g ] ( x) = [ g o f ] ( x) for all values of x. Pairs of operations that undo each other. Examples: Addition and subtraction are inverse operations. Multiplication and division are inverse operations. An equation of the form xy = k, where k ≠ 0.