A geometric term referring to a circle that is tangent to one side of a triangle and to the extensions of the other two sides.
From ex- 'outside' + radio (Latin for 'radius' or 'ray'). A mathematical term coined in geometry to describe these external circles.
Exradio circles are invisible helpers in geometry—they're outside the triangle entirely but mathematically connected, like the triangle's evil twins that help solve impossibly tricky geometry problems.
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