Question

The center of a circle is at the origin. An endpoint of a diameter of the circle is at (-3, -4). How long is the diameter of the circle?

Answer 1

hmm what are the coordinates of the origin?

Answer 2

0

Answer 3

and.... so (0,0) to be exact so the distance from those 2 points is the radius so the diameter is twice the radius
so just get that distance and double it up \(\bf \textit{distance between 2 points}\\ \quad \\
\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
&({\color{red}{ 0}}\quad ,&{\color{blue}{ 0}})\quad &({\color{red}{ -3}}\quad ,&{\color{blue}{ -4}})
\end{array}\qquad
d = \sqrt{({\color{red}{ x_2}}-{\color{red}{ x_1}})^2 + ({\color{blue}{ y_2}}-{\color{blue}{ y_1}})^2}\)

Answer 4

wuld that b any of these?

5

10

25

Answer 5

hmm well.. what did you get?