find my point if inside a circle.

i have 2 cgpoints pt1 pt2

pt2 center of circle.

how can find if pt1 within perifery of 50px radius circle centered @ pt2 ?

in advance
ch

 

sounds need distance formula.

go www.google.com , type search bar. "what distance between 2 points"

if result greater radius, point not in circle.

 

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