how do i express in parametric form
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Hello, sigma1! How do i express in parametric form? We have: . Complete the square: . And we have: . This is a circle with center and radius The parametric equations are: .
i inderstand uto the point where you complete the square but can you please explain the principle you used to arrive at your answer. thanks.
In general, which you can check by expanding the squares. In your case, a=-28, b=4, c=120. http://www.algebralab.org/lessons/le...gthesquare.xml
i do understand that point but i dont understand how you use that to get to the parametric equations. with the trig variables.
Oh. A circle of radius r centred at the origin is given by the parametric equations . This is pretty much just a definition. Can you translate these so that the centre is at the correct point?
Originally Posted by sigma1 i do understand that point but i dont understand how you use that to get to the parametric equations. with the trig variables. a circle centered at the origin, , can be written parametrically as shifting the center from the origin to the point yields the equations ... that's all.
Originally Posted by skeeter a circle centered at the origin, , can be written parametrically as shifting the center from the origin to the point yields the equations ... that's all. thanks alot i inderstand it clearly now.
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