Circle Q is centered at the origin and has a radius of 9 units. which equation could represent circle Q

x^2 + y^2 = 81

Step-by-step explanation:

Mathematically, the equation of a circle can be represented by ;

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

where (h,k) is the center of the circle which is the origin in this case. The origin has the coordinates (0,0)

the radius here is 9 units

Thus, the equation of the circle would be;

(x-0)^2 + (y-0)^2 = 9^2

= x^2 + y^2 = 81

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation:

answer is 12345678900987654321234567890987654321

step-by-step explanation: