Question

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Answer 1

Definition of circle

Step-by-step explanation:

• 1st - Given

• 2nd - Definition of radius

• 3rd - Distance formula

• 4th - Definition of circle

• 5th - Distance formula

• 6th - Definition of circle

All the points that lies on the circle must be same distance from the center.

This is given by the definition of a circle.

Additional

Radius is the length from the center to the points lying on the circle.

Distance formula:
`d =√((x_2 - x_1)^2 + (y_2 - y_1)^2)`

Diameter of circle is from one end point to another end point lying on circle.