If a scalene triangle has its measures 4 m, 11 m and 8 m, find the largest angle.
a. 129.8
b. 90.0
c. 34.0
d. 16.2

129.8 approximately

Step-by-step explanation:

So this sounds like a problem for the Law of Cosines. The largest angle is always opposite the largest side in a triangle.

So 11 is the largest side so the angle opposite to it is what we are trying to find. Let's call that angle, X.

My math is case sensitive.

X is the angle opposite to the side x.

Law of cosines formula is:

So we are looking for X.

We know x=11, a=4, and b=8 (it didn't matter if you called b=4 and a=8).

Subtract 80 on both sides:

Divide both sides by -64:

Now do the inverse of cosine of both sides or just arccos( )

[these are same thing]

Time for the calculator:

X=129.8 approximately

here is a big fat

m

step-by-step explanation: