Mont: Pythagoras

5. An angle that is more than 90 degrees but less than 180 degrees.
8. An angle that is less than 90 degrees.
10. An irrational root, not expressible as a neat fraction or decimal
13. The longest side of a right-angled triangle, opposite the right angle.
14. A mathematical principle that states in a right-angled triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides.
15. A statement that has been proven on the basis of previously established statements.
17. The value that, when multiplied by itself, gives the original number.
19. A unit of measurement of angles.

1. In a right-angled triangle, the side that is directly across from a given angle.
2. Determine the amount or number of something mathematically.
3. A simplified drawing showing the appearance, structure, or workings of something.
4. The branch of mathematics concerned with the properties and relations of points, lines, surfaces, and figures.
6. The measurement or extent of something from end to end.
7. A side of a triangle that is next to a particular angle, excluding the hypotenuse in a right-angled triangle.
9. Triangle A triangle in which one angle is a right angle (90 degrees).
10. The result of multiplying a number by itself.
11. A statement that asserts the equality of two expressions.
12. A polygon with three edges and three vertices.
16. A mathematical relationship or rule expressed in symbols.
18. A logical argument demonstrating that a certain statement is true.