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**4.**a point on one end, and it extends infinitely in the other direction.**5.**Bisector- a ray that cuts the angle exactly in half, making two equal angles.**10.**diagram- uses circles to represent relationships among sets of objects**11.**a right triangle is the side of the triangle that is opposite to the right angle.**15.**triangle- a triangle with all three sides unequal.**16.**a cube has six**17.**a segment connecting any vertex of a triangle to the midpoint of the opposite side.**18.**the point where two sides of a polygon meet.**19.**lines- two lines in the same plane that never intersect.

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**1.**Triangle- a triangle with all three angles less than 90**2.**is a polygon with exactly four sides.**3.**is a segment that passes through the center and has its endpoints on the circle.**6.**segment- s the portion of a line lying strictly between two points. It has a finite length and no width.**7.**corresponding lengths are the same, and if all corresponding angles have the same measure.**8.**theorem- states that if you have a right triangle, then the square built on the hypotenuse is equal to the sum of the squares built on the other two sides. a2 + b2 = c2.**9.**a quadrilateral that has one pair of opposite sides that are parallel.**12.**triangle-is a triangle with three equal sides.**13.**a regular quadrilateral.**14.**Angle- an angle with its vertex at the center of a circle.**20.**has only one dimension