Geometry

4. the measure of a regions size on a surface
6. the branch of mathematics concerned with specific functions of angles and their application to calculations
8. the branch of mathematics concerned with the properties and relations of points, lines,surfaces, solids,and higher dimensional analog
9. the distance across a circle through the centre
12. a point that is in the middle of the line joining two points
14. a figure plane with four straight sides and four straight angles
16. a half infinite line(also known as a half line) with one of the two points and taken to be at infinity
18. a statement that can be demonstrated to be true by accepted mathematical operations and arguments
20. the distance that surrounds a circle

1. the space occupied within the boundaries of an object in three-dimensional space
2. a two dimensional shape with 4 sides, four vertices,and four angles
3. a dot in a plane or a piece of paper
5. a point where two or more curves, lines, or edges meet.
7. the distance from the center of the circle to any point on its circumference
10. three sided polygon
11. a round plane figure whose boundary consists of points equidistant from a fixed point (the center)
13. a polygon composed of four triangular faces, six straight edges, and four vertex corners.
15. each pairs of opposite angles made by two intersecting lines
17. a two dimensional doubly ruled surface spanned by two linearly independent vectors
19. when both the hypotenuse and conclusion are negated