Area of Parametric Equation

Calculus Level 3

P : = { y = t 2 1 x = t 2 2 P:= \begin{cases} y = t^{2} - 1 \\ x = t^{2} - 2 \end{cases}

The curve P P is defined using the pair of parametric equation shown above for all real values of t t .

What is the area bounded by the curve P P and the coordinate axes?


The answer is 0.5.

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1 solution

Pranshu Gaba
Mar 27, 2016

Since t t is a real number, t 2 t^{2} will be always be non-negative. The minimum value of y y is 1 -1 and the minimum value of x x is 2 -2 .

We can subtract the given equations to get y x = 1 y- x = 1 . It's graph looks like this

It is not a complete line since x x cannot be less than 2 -2 and y y cannot be less than 1 -1 . It is, in fact, a ray starting at the point (-2, -1).

Its intercepts are ( 1 , 0 ) (-1,0 ) and ( 0 , 1 ) (0,1) . These two points along with the origin form a right triangle. The lengths of the legs of the right triangle are both 1. Therefore the area of the triangle is 1 2 × 1 × 1 = 0.5 \frac{1}{2} \times 1 \times 1 = \boxed{0.5} _\square

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