# ACT Math 4.4 Trigonometry

ACT Math: Trigonometry Drill 4, Problem 4. What is the equation of the graph in the video?

 ACT Math Trigonometry ACT Mathematics Trigonometry Foreign Language Arabic SubtitledChinese SubtitledKorean SubtitledSpanish Subtitled Geometry Right Triangles and Trigonometry Language English Language Product Type ACT Math Trigonometry Graphing trigonometric functionsSOHCAHTOA (values and properties of trig functions)Solving right triangles

### Transcript

00:22

First we should find out length of the final side

00:26

by using the Pythagorean Theorem - A sqaured plus B squared equals C squared

00:29

we can determine that root 2 squared plus

00:32

X squared equals 2 squared. That's 2 plus x squared equals 4...

00:36

Subtract 2 from both sides and X squared equals 2.

00:40

Take the square root of both sides and X equals the square root of 2.

00:43

Awesome. That means we have an isosceles triangle where two sides are equal

00:47

better yet when two sides are equal that means that 2

00:50

angles are equal. Even better we already know that one angle is 90 degrees

00:55

since the triangle is a right triangle, which means

00:59

that the other two angles have to measure 45 degrees each

01:02

and we have our answer it's C.