All combustible materials within a 35-feet (11-m) radius of the hot work should be either removed or shielded from potential heat, sparks or flame.
In classical geometry, a circle's or sphere's radius is any line segment that connects the object's center to its perimeter; in more contemporary usage, it also refers to the line segments' length. The word "radius" is derived from the Latin word "radius," which also refers to a spoke on a chariot wheel. Radius has two possible plurals: the traditional English plural radiuses or radii (from the Latin plural). R or r is the most common radius abbreviation and mathematical variable name.
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