math

2. 1.A plane figure with three straight sides and three angles.
4. A straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.
6. A mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one.
10. A length or portion of time.
11. The longest side of a right triangle, opposite the right angle.
14. the law of sines (also known as the sine law, sine formula, or sine rule) is an equation relating the lengths.
15. unit of measurement of angles, one three-hundred-and-sixtieth of the circumference of a circle: "set at an angle of 45 degrees".
17. unit circle is a circle with a radius of one. Frequently, especially in trigonometry, the unit circle is the circle of radius one centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane
19. 1.The ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right-angled triangle); the reciprocal of a cosine.

1. formula named after Heron of Alexandria, states that the area A of a triangle whose sides have angles.
3. angle the angle of less than 360 degrees that corresponds to an angle of over 360 degrees; In order to get the reference angle.
5. the law of cosines (also called the cosine rule for sides) is a theorem relating the sides and angles.
6. A unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius.
7. (in a right-angled triangle) The ratio of the side (other than the hypotenuse) adjacent to a particular acute angle to the side opposite
8. The maximum extent of a vibration or oscillation, measured from the position of equilibrium.
9. A round plane figure whose boundary (the circumference) consists of points equidistant from a fixed center.
12. The trigonometric function that is equal to the ratio of the side opposite a given angle (in a right triangle) to the hypotenuse.
13. The trigonometric function that is equal to the ratio of the side adjacent to an acute angle (in a right-angled triangle) to the hypotenuse.
16. A plane figure with four equal straight sides and four right angles.
18. The ratio of the hypotenuse (in a right-angled triangle) to the side opposite an acute angle; the reciprocal of sine.