|By Kkhimji (Kkhimji) on Monday, April 12, 2004 - 08:40 am: Edit|
what is the radius of this circle?
What is area of circle?
|By Tsunashima1 (Tsunashima1) on Monday, April 12, 2004 - 01:01 pm: Edit|
That's not a circle. It's an ellipse.
|By Songster87 (Songster87) on Monday, April 12, 2004 - 03:40 pm: Edit|
Square x and y, divide, and add.
x^2 = a^2 * cos^2
x^2/a^2 = cos^2
y^2 = b^2 * sin^2
y^2/b^2 = sin^2
x^2/a^2 + y^2/b^2 = cos^2 + sin^2
x^2/a^2 + y^2/b^2 = 1
And like Ts..... pointed out, it's an ellipse.
|By Kkhimji (Kkhimji) on Tuesday, April 13, 2004 - 08:53 am: Edit|
Ok, how would you work out the area?
|By Deepwood6 (Deepwood6) on Tuesday, April 13, 2004 - 09:31 am: Edit|
integrate that beast
|By Tsunashima1 (Tsunashima1) on Tuesday, April 13, 2004 - 09:50 am: Edit|
Yeah if you do int(y dx) from 0 to 2pi you get -pi*a*b. I'm just not sure how to get rid of that negative sign.
|By Tsunashima1 (Tsunashima1) on Tuesday, April 13, 2004 - 01:14 pm: Edit|
Actually I just realized we have to sweep from left to right so it will be 2pi to 0, giving the correct answer of pi*a*b.
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