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### 17 Cards in this Set

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 Half of a whole is what percent of the whole? 50% An ________ is formed by two rays that have a common endpoint. We call the common endpoint the _________. angle vertex A ________ describes a whole as if there were 100 parts. percent When there is no chance of confusion, an angle may be named with only one letter. If there is a chance for confusion, we use three letters to name the angle. The _________ must be the center letter in the group of three letters. vertex An angle smaller than a right angle is called an _________ angle. acute A _____ is a part of a line with one endpoint. ray An angle that is smaller than a straight angle but larger than a right angle is called an ________ angle. obtuse Lines that intersect and form "square corners" are called _______________ lines. perpendicular An angle that is formed by perpendicular lines is called a ________ angle. right A _____ is an infinite number of points extending in opposite directions without end. line In a fraction, the number below the bar is called the ____________ and tells how many equal parts are in the whole. denominator A _________ is a part of a line with two endpoints. segment An angle that forms a straight line is called a _________ angle. straight Two lines in the same plane that do not intersect and remain the same distance apart are called ____________ lines. parallel In a fraction, the number above the bar is called the ____________ and tells how many parts have been selected. numerator When we name a ray, the ________ must be listed first. endpoint If two lines cross, we say that they _____________. intersect