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### 15 Cards in this Set

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 Definition: Collinear Two or more points that lie on the same line. Definition: Non-Collinear Points that do not lie on the same line. Definition: Coplaner Two or more points that lie on the same plane. Segment Addition Postulate If Q is between P and R, then PQ + QR = PR. If PQ + QR = PR, then Q is between P and R. Pythagorean Theorem If a triangle is right, then the sum of the squares of the measures of the legs equals the square of the measure of the hypotenuse. Definition of a Midpoint The midpoint M of PQ is the point between P and Q such that PM = MQ. Midpoint Formula 1. On a number line, the coordinate of the midpoint of a segment whose endpoints have coordinates a and b is (a+b)/2. 2. In a coordinate plane, the coordinates of the midpoints of a segment whose endpoints have coordinates (x1, y1) and (x2, y2) are ((x1 + x2)/2, (y1 + y2)/2). What is the interior of an angle? What is the exterior of an angle? Angle Additon Postulate If R is in the interior of