# math

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hi

#### Storyboard Text

• 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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