In geometry, the incircle or inscribed circle of a triangle is the largest circle that can be contained in the triangle; it touches (is tangent to) the three sides.

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Scientists have discovered a core in the core of the Earth's core. Its radius was estimated at 650 kilometers

Proton’s mass radius is apparently shorter than its charge radius: The quarks that give it charge aren't hanging out with the gluons that provide mass

Evidence for the volatile-rich composition of a 1.5-Earth-radius planet

Rosette Nebula: A Human Skull-shaped Nebula with a Radius of 65 light-years.

Physicists extract proton mass radius from experimental data