i have a curve from(-2,0) to (2,0) half circle

how to find the formula for x

and y

?

i know that its some sort of trigonometric expression

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- May 28th 2011, 03:19 PMtransgalacticfinding parametric representation of half circle mmn16 1a
i have a curve from(-2,0) to (2,0) half circle

how to find the formula for x

and y

?

i know that its some sort of trigonometric expression - May 28th 2011, 03:36 PMmr fantastic
- May 28th 2011, 03:39 PMAlso sprach Zarathustra
x=R*cos(t)

y=R*sin(t)

{IT BECAUSE x^2+y^2=R^2 describes a circle}

R is the radius. (R=2 in your case)

t-is angle.

Now, in your opinion which restriction should be on t to get half circle? - May 29th 2011, 12:49 AMtransgalactic
t from 0 to pi

thanks

:)