Circle Between Two Circles (Out/In)
Creates a circle of specified radius externally tangent to one circle and internally tangent to another. XL/XS/YL/YS and OUT/IN selectors specify the solution.
What It Does
The Circle/Out,C,In,C operator creates a circle of specified radius that is externally tangent to one reference circle and internally tangent to another. The C1 OUT/IN and C2 OUT/IN selectors specify the tangency type for each circle. The X/Y selector picks the position.
Syntax
Quick Input
Direction Selector
The C1 and C2 selectors specify whether the new circle is externally (OUT) or internally (IN) tangent to each reference circle. The X/Y selectors pick which of the resulting solutions to use based on centre position.
| Field | Options | Meaning |
|---|---|---|
C1 | OUT / IN | External or internal tangency to first circle |
C2 | OUT / IN | External or internal tangency to second circle |
X | XL / XS | Largest or smallest X centre coordinate |
Y | YL / YS | Largest or smallest Y centre coordinate |
Worked Examples
Analytic Rule
FAQ
What is the difference between OUT and IN tangency?
OUT (external) tangency means the new circle sits outside the reference circle touching it at one point. IN (internal) tangency means the new circle encloses the reference circle touching it internally.