# 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 Subtitled Chinese Subtitled Korean Subtitled Spanish Subtitled |

Geometry | Right Triangles and Trigonometry |

Language | English Language |

Product Type | ACT Math |

Trigonometry | Graphing trigonometric functions SOHCAHTOA (values and properties of trig functions) Solving right triangles |

### Transcript

First we should find out length of the final side

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

we can determine that root 2 squared plus

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

Subtract 2 from both sides and X squared equals 2.

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

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

better yet when two sides are equal that means that 2

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

since the triangle is a right triangle, which means

that the other two angles have to measure 45 degrees each

and we have our answer it's C.