Welcome to your Trigonometry

1.
f the circumference of a circle is divided into 360 congruent parts, the angle sub- tended by one part at the center of the circle is called

2.
2.25 revolutions are how many degrees?

4.
If α,β,γ are the angles of a triangle ABC, then cos(α + β) =

5.
In 30 minutes, the hours hand of a clock turns through

7.
The central angle of an arc of a circle whose length is equal to the radius of the circle is called the

8.
The area of a sector with a central angle of 1 radians in a circular region whose radius is 2m is

9.
The system of measurement in which the angle is measured in radians called the

10.
Sin A=2.5x, cos A= 5.5x. Find A.

11.
Given a right triangle ABC. Angle C is the right triangle. BC=4 and the altitude to the hypotenuse is 1 unit. Find the area of the triangle.

12.
If an arc of length l of circle of radius r students' an angle θ radian at the center, then l =

13.
tan(45°+A)tan(45°-A) =

14.
In an oblique triangle, a=25, b=16, angle C=94˚06’. Find the measure of angle A.

15.
If sinA=2.571x, cosA=3.06x, and sin2A=3.939, find the value of x.

16.
If arc tan x + arc tan 1/3 = π/4, find the value of x.

19.
sin3θ/sinθ -cos3θ/cosθ =

20.
Two cities whose longitudes are 20°E and 40°W on the equator are apart