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 2 years ago
(Precal: law of cosines)
Find the area of the triangle.
A=47 degrees
b=32ft
c=19 ft
@amistre64
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.1law of cosine is a general version of the pythag thrm

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

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

AmberBamber
 2 years 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
 2 years 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
 2 years 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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