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hi

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  • Ugh!!!
  • Hello class! Let's go over the method of finding an unknown side, for the Law of Cosines. 
  • a²= b² + c²- 2 bccosA b²= a² + c²- 2 accosB c²=a² + b² - 2 abcosC
  • I know! The equation is  a²= b² + c²- 2 bccosA
  • B
  • Start by choosing the right equation, that will solve for the unknown side.
  • x
  • 60°
  • A
  • A
  • C
  •  a²= (3)² + (2)²- 2 (3)(2)cosA(60)
  • Correct! Now we plug in the known values, into the equation. 
  •  a²= (3)² + (2)²- 2 (3)(2)cos(60) a2= 9 + 4 - 12cos(60)  a2= 13 - 12cos(60) a≈ 2.65
  • Now we solve for A
  • Finally it's done!!
  • B
  • YAYAYAYAYAYY!!!!!
  • a≈ 2.65
  • 60°
  • Now we can plug in the value for side A
  • C
  • RIIIIIIINNNNNNNNGGGG
  • School's out! Thanks for being awesome students
  • I'm out of hereeeee
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