what is the point circle: A circle which has zero ( 0 ) distance (radius) from point ( . ) is called point circle .In other word; The point is called point circle because a point has no distance (radius).
Example : When r = o then the point is called point circle.
what is equation of circle:
(i ) C ( h , k) be a centre of circle.
(ii) r be the radius of circle .
( iii) P ( x , y) be any point on the circle .
| C P | = r distance between P ( x , y ) to the centre of circle is equal to the radius of the circle .
| C P |² = r ² = ( x – h ) ² + ( y – k )² = r ²
( a )
| C P |² = r ²
( b )
( x – h ) ² + ( y – k )² = r ²
This equation is known as equation of circle in standard form.
circle of diameter symbol example
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