# How do you find the equation of a circle center at the origin; passes through (10, 10)?

##### 1 Answer

Jun 26, 2016

#### Explanation:

You can use Pythagoras for this by treating the x-axis and y-axis as if they were sides of a triangle and a line from the origin to the point

Let the hypotenuse be the radius (r) of the circle

Then

So the equation of the circle is: