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**3.**"the Father of Geometry"**6.**the point that cuts a segment in half**7.**the study of points, lines, planes, and shapes**11.**the point where 2 rays meet to make an angle**12.**2 angles with a sum of 90**14.**2 adjacent angles that are supplementary**15.**statements accepted as true without proof**17.**has one endpoint and goes forever**18.**angles are measured by these**19.**this is formed by 2 opposite rays**20.**any angle less than 90 degrees

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**1.**it has 2 endpoints and can be measured**2.**a 90 degree angle**4.**describes a location and has no width or depth**5.**segments with the same measure are called this**8.**represented by a flat surface that extends in all directions**9.**a ray or line that cuts an angle into 2 equal angles**10.**2 angles with a sum of 180**11.**angles formed by intersecting lines and are always equal**12.**points on the same line**13.**points in the same plane**16.**your favorite Geometry teacher