That depends on what you want to 'do' to them.
It helps to remember these two simple facts. They will solve
most of the problems that involve a 30-60-90 triangle:
-- The side opposite the 30 is (1/2 of the hypotenuse).
-- The side opposite the 60 is (1/2 of the hypotenuse) times the sqrt(3) (or 31/2).
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A 30, 60, 90 triangle is a right triangle. It's one of the most common triangles to use to learn about the Pythagorean theorem.
1 FT
30 30x1=30 30x2=60 30x3=90
4 times the square root of 3. Use an equilateral triangle and 30-60-90 triangles.
The GCF is 15.