Question

What is the radius of a circle whose equation is (x – 7)2 + (1 - 10)2 = 4?2 units4 units8 units16 units

Answer 1

Answer: the answer is A. 2 units.

Step-by-step explanation: it is show below.

Answer 2

In order to find the radius of this circle, we can compare this equation with the following standard equation of a circle:

`(x-h)^2+(y-k)^2=r^2`

Comparing the right side of each equation, we have:

`\begin{gathered} r^2=4 \\ r=\sqrt[]{4} \\ r=2 \end{gathered}`

The radius is 2 units, therefore the correct option is the first one.