# How do you find the equation of a circle center is at (0, 0) and that is tangent to the line x + y = 8?

##### 1 Answer

Dec 2, 2016

circle eqn.

#### Explanation:

the eqn. of the circle is of the form

if

giving

a quadratic in

if **EQUAL** roots

ie

we have:

circle eqn.

a quick check

put

from

tangent at

double check with

consistent.