Finding the Area of a Triangle for the Area of a Segment?

I'm looking for the area if a segment. I know that the formula for the area of a triangle is 1/2bh but for some reason, my answers are turning out wrong. Triangle 1: Side - 11km Angle - 60 degrees Judging by the fact the one angle is 60 degrees, I assumed that it was equilateral. I got the area to be... show more I'm looking for the area if a segment. I know that the formula for the area of a triangle is 1/2bh but for some reason, my answers are turning out wrong.

Triangle 1:
Side - 11km
Angle - 60 degrees
Judging by the fact the one angle is 60 degrees, I assumed that it was equilateral.
I got the area to be 52.25 km...?

And for the other triangles:
Side - 25 yd
Side - 25 yd
Angle - 45 degrees

And

Side - 1
Side - 1
Angle - 90 degrees
1 answer 1