Trigonometry

5. In a right angled triangle:the square of the hypotenuse is equal tothe sum of the squares of the other two sides.
8. The three trigonometric ___ are the sin, cos and tan
10. a triangle in which one angle is a right angle (that is, a 90-degree angle)
12. Something that has magnitude and direction
13. This type of trig function we used when we need to solve for the angle
14. The length of the hypotenuse divided by the length of the opposite side.
15. Two angles whose sum is 90 degrees.
16. Greek scientist that studied trigonometry
19. The intersection of x-axis and y-axis
20. The length of the opposite side divided by the length of the hypotenuse.
21. The length of the hypotenuse divided by the length of the adjacent side.

1. One of the four regions in the coordinate plane created by the intersection of the axes
2. A diagram that shows how one group of quantities relates to another
3. A tool that we use to measure angles
4. A measure for angles.
6. A branch of mathematics that studies relationships involving lengths and angles of triangles
7. a circle whose radius has a length of one unit.
9. The amount of turn between two straight lines that have a common end point (the vertex).
11. The side opposite the right angle in a right-angled triangle
17. The length of the adjacent side divided by the length of the hypotenuse
18. The length of vector