Math Crossword

4. A line that a curve approaches but never reaches.
7. Part of the circumference (edge) of a circle.
9. How steep a straight line is.
11. Where lines cross over.
13. The amount of turn between two straight lines that have a common end point (the vertex).
15. A result that has been proved to be true (using facts that were already known).
17. An expression that has a square root, cube root, etc.
18. Is equal to 1 over tangent.

1. When one shape becomes exactly like another if you flip, slide or turn it.
2. The study of numbers, patterns, space, and change.
3. A symbol for a number we don't know yet. It is usually a letter like x or y.
5. The result of adding two or more numbers.
6. An idea that something never ends, it is sometimes used like a number but it is not really.
8. Is equal to 1 over sine.
10. A straight line going through the center of a circle connecting two points on the circumference.
12. Moving a shape, without rotating or flipping it. "Sliding".
14. A value that you get closer and closer to, but never quite reach it.
16. A diagram of values, usually shown as lines or bars.
18. The length of the adjacent side divided by the length of the hypotenuse.
19. A 3-sided polygon (a flat shape with straight sides).