Question

What is the radius for a circle whose equation is x2 + y2 = 36?A. 18B. 36C. 1296D. 6

Answer 1

D. 6

Step-by-step explanation:

The general equation for a circle centered at the origin (0,0) is:

`x^2+y^2=r^2`

Given the equation of the circle:

`\begin{gathered} x^2+y^2=36 \\ \implies r^2=36 \\ r^2=6^2 \\ r=6 \end{gathered}`

Thus, the radius of the given circle is 6.