ACT Math 1.4 Trigonometry
ACT Math: Trigonometry Drill 1, Problem 4. Can you find the sine?
|Foreign Language||Arabic Subtitled|
|Functions||Extend the domain of trigonometric functions using the unit circle|
|Geometry||Right Triangles and Trigonometry|
|Product Type||ACT Math|
|Trigonometry||SOHCAHTOA (values and properties of trig functions)|
Solving trigonometric equations
Just think of pi as a 180 degrees. How did we come up with that?
Well the formula for the circumference of a circle is 2
pi times the radius of the circle.
Well in a unit circle, that's where the radius is just 1,
we can describe a full 360 degrees of a circle as 2pi
times one or just 2pi radians
if 360 degrees is 2pi radians...half of 360 is 180 or
pi radians. Plug in 180 for pi
in sine over pi over 4... 180 divided by four is 45
Sine of 45 degrees is the square root of 2 over 2.
Option D is our answer.