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#### Petrus

##### Well-known member

- Feb 21, 2013

- 739

I start read about area of parametric equation and got some problem understanding.

I got two question. here is a link

**1**. Does it mather if we say \(\displaystyle x=f(t)\) and \(\displaystyle y=g(t)\) on \(\displaystyle a \leq x \leq b\)

Does this both formula works?

\(\displaystyle \int_\alpha^\beta g(t)f'(t)dt\) and \(\displaystyle \int_\alpha^\beta g'(t)f(t)dt\)

**2**. Could someone give me an exemple on that "

**Area Under Parametric Curve, Formula II"**

\(\displaystyle \int_\beta^\alpha f(t)g(t)dt\)

Regards,