Question

to derive the standard formula of a circle, a radius r is constructed as the hypotenuse of a right triangle as shown.
what are the lengths of the sides of the right triangle that is formed? check all that apply.
□ h
□ k
□ h−k
□ x−h
□ x−y
□ y−h
□ y−k

Explanation:

The right triangle has vertices at $D(h,k)$, $F$, and $E(x,y)$. The horizontal leg is the difference in x-coordinates of $E$ and $D$, and the vertical leg is the difference in y-coordinates of $E$ and $D$.

Answer:

$\boldsymbol{x-h}$, $\boldsymbol{y-k}$