Question

the point 3,0 lies on a circle with the center at the origin what is the area of the circle to the nearest hundredth

Answer 1

-- The point (3, 0) is on the circle. 

-- So the distance to it from the center of the circle
must be the radius of the circle.

-- The center of THIS circle is at the origin.

-- The distance from the origin to (3, 0) is 3 .

-- The radius of this circle is 3 .

-- The area of any circle is (pi) (radius of the circle)²

-- The area of THIS circle is (pi) (3)² = 9 pi  =  28.27  (rounded)