What is the largest angle measure in a triangle with sides of lengths 3, 5, and 7? (I think you need to solve this with algebra)
Thank you!
+128408 Actually....we can use something called the Law of Cosines....the largest angle will be opposite the greatest side
[If you haven't had trig....don't worry about it.....this solution will give you your answer ]
cos (angle) = [ 7^2 - 5^2 -3^2 ] / [ -2 (3) (5) ]
cos (angle) = [ 15 ] / [- 30 ]
cos (angle) = -1/2
arccos (-1/2) = angle = 120°
