Given the equation of a circle in the form

You have that
is the center, and
is the radius.
So, in your case, the center is
and the radius is 5.
i dont know, sorry...............................................
We find the value for s here.
8s = 1/2

1/2 divided by 8/1 = 1/2 * 1/8 = 1/16
s = 1/16
The area of this shape is 12.
Area of a triangle = 1/2 x bh
b= base
h = height
So,
1/2 (6)(4)=12
Hope this helps!