program to get an area of a sphere

Hi...

i am looking for some help.
I would need someone to help me to solve an equation.

I have to solve an equation that get different area shapes of a sphere
and lists them as the solution. depending which angle u put in at the beginning.

maybe u can help me to program that!?
it is to hard for me.. cause I haven't done anything in VB before.

here is the equation for the solution

solution here

is that possible?

Hey
I am a bit confused with the equantions :
Can i write that the area of a sphere with radius r and for an angle a is :

2*pi*r*r* ((-cos(a)) -(-cos(0))
or
2*pi*r*r* (1 - cos(a))

Is this mathematically correct. If yes we can solve your problem easily.If not can you write the equantion without the integral sign.(i think the equation is correct, i derived it from eq-2 of the first page by replacing pi with a)


If i am correct then :

you need 2 input txtboxes txtradius and txtangle and output txtbox, lets say txtarea

txtarea.Text = ((2*(Math.Pi)*(cInt(txtradius.Text))*(cInt(txtradius.Text)))*(1 - Math.cos(cInt(txtangle.Text)))).ToString


Best of luck