Question

(Pre-cal: law of cosines)
Find the area of the triangle.
A=47 degrees
b=32ft
c=19 ft

@amistre64

Answer 1

law of cosine is a general version of the pythag thrm

Answer 2

in this case:

a^2 = b^2 + c^2 - 2bc cosA

Answer 3

when the angle given is 90 degrees this simplifies to:

a^2 = b^2 + c^2 such that a is the hypotenuse

Answer 4

Oh, so I need to find a before I can do s=a+b+c/2 and plug in for are.

Answer 5

area*

Answer 6

Then plug in s and the values of a, b, and c in the area formula. A=sqrts(s-a)(s-b)(s-c)

Answer 7

if you want to do herons formula then yes, you would need to know all the side lengths

Answer 8

Okay, well that's the only way I learned so I'm going to do it that way. But thank you! I needed a refresher :)

Answer 9

good luck :)

Answer 10

Thanks. :)