Question

How do you find the area of circle `x^2 + y^2 = 25`?

Answer 1

`25 pi`

Explanation:

The center of the circle is at (0,0) and, when x = 0, the circle points are at `y=-5` and `y=5`. So, the radius of the circle is r = 5.
The area of a circle is given by `pi r^2`. So, substituting `r=5`, one gets the answer: `25 pi`.