FORM 3 MATH: Equation of a circle

Hello! in this video you will learn:
I) how to find midpoint of two points given coordinates.
II) how to find the magnitude of a line segment.
II) how to determine equation of a circle given the centre and radius.

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[claudiavincy]

Hello does this cover the whole part of equation of a circle

[EvalyneKerubo-gi]

Can someone use the magnitude of BC and get the radius