Have what idea ah, is through any point outside the circle tangent, a line, two is better

CodePudding user response:

Make a right triangle:
1 is round radius R square edge;
The hypotenuse is outside the circle center and circle point of attachment;
Turning radius R, find and 1 (R) vertical rectangular right-angle side 2;
Then the tangent circle and do.

CodePudding user response:

Are there not the tangent equation of circle