# Department of Mathematical and Computer Sciences

## Khan Academy MTH 1120

### This website shows Khan Academy links for most topics in MTH 1120.

First find the chapter you want in the menu below.

Scroll down through each section to see some links to Khan Academy videos and practice problems for topics in this section.

**TRY THEM OUT!**

Topic | Videos | Practice Problems |
---|---|---|

Finding the complement and the supplement of an angle | Complementary and supplementary angles | Complementary and supplementary angles practice |

Finding measures of complementary and supplementary angles | Angle addition postulate | |

Calculating with degrees, minutes, and seconds | ||

Converting between angle measures | ||

Finding measures of coterminal angles |

Topic | Videos | Practice Problems |
---|---|---|

Vertical angles | Intro to vertical angles | Vertical angles practice |

Transversals | ||

Angle sum of a triangle | Triangle angle example | |

Conditions for similar triangles | Similar triangles practice | |

Finding side lengths in similar triangles | How to find a missing measure with similar triangles | Solving similar triangles |

Topic | Videos | Practice Problems |
---|---|---|

Pythagorean theorem | Intro to Pythagorean theorem | Pythagorean theorem practice |

Distance formula | Distance formula | Distance formula practice |

Trigonometric functions | Trigonometry practice | |

Finding function values of an angle | ||

Finding function values of quadrantal angles |

Topic | Videos | Practice Problems |
---|---|---|

Reciprocal identities | Reciprocal trig functions practice | |

Identifying the quadrant of an angle | ||

Determining whether a value is in the range of a trig function | Graph of sin(x) | |

Finding all function values given one value and the quadrant | ||

Pythagorean identities | ||

Quotient identities | ||

Using identities to find function values | Use the Pythagorean trig identity | Circles and Pythagorean identities |

Topic | Videos | Practice Problems |
---|---|---|

Cofunction identities | ||

Trigonometric function values of special angles |

Topic | Videos | Practice Problems |
---|---|---|

Finding reference angles | ||

Finding trig function values using reference angles | ||

Using coterminal angles to find function values | ||

Finding angle measures given an interval and a function value |

Topic | Videos | Practice Problems |
---|---|---|

Finding function values with a calculator | ||

Using inverse trig functions to find angles | Intro to inverse trig functions | Solving for an angle practice |

Topic | Videos | Practice Problems |
---|---|---|

Significant digits | Significant figures | Significant figures practice |

Solve a right triangle given an angle and a side | Solving for a side in a right triangle | Trigonometry practice 2 |

Solve a right triangle given two sides | Intro to inverse trig functions | Solve for an angle in a right triangle |

Find a length given the angle of elevation | Right triangle word problem | Applying right triangles |

Find an angle of depression | Angles of elevation and depression |

Topic | Videos | Practice Problems |
---|---|---|

Solve a problem involving bearing | ||

Use trig to measure a distance | ||

Solve a problem involving angles of elevation | Right triangle word problem |

Topic | Videos | Practice Problems |
---|---|---|

Radians | Intro to radians | |

Converting between degrees and radians | Degrees to radians practice | |

Finding function values of angles in radian measure |

Topic | Videos | Practice Problems |
---|---|---|

Arc length | Arc length | Arc length practice |

Area of a sector | Area of a sector | Areas of circles and sectors |

Topic | Videos | Practice Problems |
---|---|---|

Unit circle | Unit circle definition of trig functions | |

Circular functions | Matching ratios to trig functions | |

Finding circular function values |

Topic | Videos | Practice Problems |
---|---|---|

Linear speed | Relationship between angular velocity and speed | |

Angular speed | Relationship between angular velocity and speed |

Topic | Videos | Practice Problems |
---|---|---|

Graph of the sine function | Graph of y=sin(x) | |

Graph of the cosine function | ||

Amplitude | ||

Period |

Topic | Videos | Practice Problems |
---|---|---|

Horizontal translations | Shifting and reflecting functions | Graphs of trig functions practice |

Topic | Videos | Practice Problems |
---|---|---|

Graph of the tangent function | Graph of y=tan(x) | |

Graph of the cotangent function |

Topic | Videos | Practice Problems |
---|---|---|

Graph of the secant function | ||

Graph of the cosecant function |

Topic | Videos | Practice Problems |
---|---|---|

Fundamental identities |

Topic | Videos | Practice Problems |
---|---|---|

Verifying an identity |

Topic | Videos | Practice Problems |
---|---|---|

Cosine of a sum or difference | Trig addition identities practice | |

Cofunction identities |

Topic | Videos | Practice Problems |
---|---|---|

Sum and difference identities for sine | Trig addition identities practice | |

Sum and difference identities for tangent |

Topic | Videos | Practice Problems |
---|---|---|

Double-angle identities | Double angle formula for cosine | Trig addition identities practice |

Product-to-sum identities |

Topic | Videos | Practice Problems |
---|---|---|

Half-angle identities |

Topic | Videos | Practice Problems |
---|---|---|

Inverse sine function | Intro to arcsine | Inverse trig functions practice |

Inverse cosine function | Intro to arccosine | Inverse trig functions practice |

Inverse tangent function | Intro to arctangent | Inverse trig functions practice |

Inverse secant, cosecant, and cotangent |

Topic | Videos | Practice Problems |
---|---|---|

Solving a trigonometric equation by linear methods |

Topic | Videos | Practice Problems |
---|---|---|

Equations with half-angles | ||

Equations with double-angles | ||

Equations with multiple-angles |

Topic | Videos | Practice Problems |
---|---|---|

Solve an equation involving inverse trig functions |

Topic | Videos | Practice Problems |
---|---|---|

Solving oblique triangles | Determining congruent triangles | Congruent triangles practice |

Law of Sines | Law of Sines practice |

Topic | Videos | Practice Problems |
---|---|---|

The ambiguous case |

Topic | Videos | Practice Problems |
---|---|---|

Law of Cosines | Law of Cosines practice | |

Heron's Area formula | Heron's formula |

Topic | Videos | Practice Problems |
---|---|---|

Vectors | Intro to vectors and scalars | |

Sum of vectors | ||

Scalar multiplication of vectors | Scalar multiplication | Scaling vectors practice |

Finding the magnitude of a resultant | Vector word problems |

Topic | Videos | Practice Problems |
---|---|---|

Vector components | Components of vectors | Components of vectors practice |

Magnitude and direction with components | ||

Vector operations with components | ||

The dot product | Vector dot product | |

Finding the angle between two vectors | Defining the angle between vectors |

Topic | Videos | Practice Problems |
---|---|---|

Imaginary unit i | i and imaginary numbers intro | |

Complex numbers | ||

Addition and subtraction of complex numbers | Adding complex numbers | Adding and subtracting complex numbers |

Multiplication of complex numbers | Multiplying complex numbers | Multiplying complex numbers practice |

Complex conjugates | Complex conjugates | Find conjugates of complex numbers |

Simplifying powers of i | Powers of the imainary unit | Imaginary unit powers |

Topic | Videos | Practice Problems |
---|---|---|

Polar form | Polar and rectangular forms of complex numbers | Polar form practice |

Topic | Videos | Practice Problems |
---|---|---|

Rectangular and polar coordinates | Polar coordinates 1 | |

Finding polar equations of lines and circles | Polar coordinates 2 | |

Converting a polar equation to a rectangular equation | Polar coordinates 3 |

Topic | Videos | Practice Problems |
---|---|---|

Parametric equations of a plane curve |

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