3 point -circle

(x-p)2 - (y-q)2 = r2

3 point circle calculation

Somethime you will need to calclulate radius from scratch. Just mesure 3 point from coordinate begeeining, and this simple calculator will do job. You will get basic circle parameters

be sure that X1 and X3 point doesnt have same value, also points Y1 and Y3
Lights

Example : make coordinate begining, and select point A,B C, then measure distance

Missinag data

 pvc:  77