Trigonometry – Law of Cosines

1.) Click to print the worksheet

2.) Watch video using worksheet


3.) Take the quiz

Cue presidential music: "Hello, my fellow YayMathers. It is indeed my great and honored pleasure, to teach you how to solve triangles using the Law of Cosines, from right within the Oval Office. It's a great follow up from our epic lesson on the Law of Sines. These topics are not only useful within Trigonometry, but also for Algebra 2, Pre calculus, and Calculus. I'm grateful to use this platform in this way, to advance the Yay Math mission. And so I'll say once again, YAY MATH!"

Yay Math is a free and openly available public service. Any contribution towards this movement is deeply appreciated.

  • Facebook App Icon
  • Twitter App Icon
  • Black Instagram Icon
  • YouTube Classic
  • LinkedIn Social Icon
Sign up using QR code

Yay Math will always stay connected to the people. Reach out and share your story! This is not a math help line. It's a way for us to interact and say hi, directly.

© 2020 Yay Math™