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 one year ago
(Precal: law of cosines)
Find the area of the triangle.
A=47 degrees
b=32ft
c=19 ft
@amistre64
 one year ago
(Precal: law of cosines) Find the area of the triangle. A=47 degrees b=32ft c=19 ft @amistre64

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amistre64
 one year ago
Best ResponseYou've already chosen the best response.1law of cosine is a general version of the pythag thrm

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1in this case: a^2 = b^2 + c^2  2bc cosA

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1when the angle given is 90 degrees this simplifies to: a^2 = b^2 + c^2 such that a is the hypotenuse

AmberBamber
 one year ago
Best ResponseYou've already chosen the best response.0Oh, so I need to find a before I can do s=a+b+c/2 and plug in for are.

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1dw:1359387445633:dw

AmberBamber
 one year ago
Best ResponseYou've already chosen the best response.0Then plug in s and the values of a, b, and c in the area formula. A=sqrts(sa)(sb)(sc)

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1if you want to do herons formula then yes, you would need to know all the side lengths

AmberBamber
 one year ago
Best ResponseYou've already chosen the best response.0Okay, well that's the only way I learned so I'm going to do it that way. But thank you! I needed a refresher :)
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