Question

@jim_thompson5910 Graph the circle with center at (-2, 1) and diameter 18. Label the center and at least four points on the circle. Write the equation
of the circle.

Answer 1

equation
of the circle with centre (a,b) and radius r is
\[(x-a)^2+(y-b)^2 =r^2\]

Answer 2

if the diameter is 18, then the radius is 9 (since 9 is half of 18)

Answer 3

so you graph this by plotting the center (-2,1)

Then going 9 units in every direction from the center to graph the circle

Answer 4

thanks

Answer 5

your equation would be

\[\Large (x-h)^2+(y-k)^2 =r^2\]

\[\Large (x-(-2))^2+(y-1)^2 =9^2\]

\[\Large (x+2)^2+(y-1)^2 =81\]

after plugging in the center and radius