the Pythagorean theory
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Measure them
A radius of a regular triangle is 12 . find the length of one side of the triangle?
Measure it or use trigonometry if the 'included' angle is given.
Use a ruler and measure one side only. All sides will measure the same if the triangle is equilateral.
-- Measure or calculate the length of one side. -- Measure or calculate the length of another side. -- Measure or calculate the length of the only remaining side. -- Add the three numbers. The sum is the perimeter of the triangle.