30 POINTS AVAILABLE1.Write the equation of a circle with the endpoints of the diameter at (-1, 6) and (5, -4). Watch the signs!
Accepted Solution
A:
Answer:[tex]\large\boxed{(x-2)^2+(y-1)^2=34}[/tex]Step-by-step explanation:The equation of a circle in standard form:[tex](x-h)^2+(y-k)^2=r^2[/tex](h, k) - centerr - radiusWe have the endpoints of the diameter: (-1, 6) and (5, -4).Midpoint of diameter is a center of a circle.The formula of a midpoint:[tex]\left(\dfrac{x_1+x_2}{2};\ \dfrac{y_1+y_2}{2}\right)[/tex]Substitute:[tex]h=\dfrac{-1+5}{2}=\dfrac{4}{2}=2\\\\k=\dfrac{6+(-4)}{2}=\dfrac{2}{2}=1[/tex]The center is in (2, 1).The radius length is equal to the distance between the center of the circle and the endpoint of the diameter.The formula of a distance between two points:[tex]d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]Substitute the coordinates of the points (2, 1) and (5, -4):[tex]r=\sqrt{(5-2)^2+(-4-1)^2}=\sqrt{3^2+(-5)^2}=\sqrt{9+25}=\sqrt{34}[/tex]Finally we have:[tex](x-2)^2+(y-1)^2=(\sqrt{34})^2[/tex]