in an equilateral triangle RST, R has coordinates (0.0)and T has coordinate of (2a,0).Find the coordinates of S in terms of a.

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asked by katie
  1. By symmetry, S must lie on the vertical line x=a.
    Let the coordinates of S be (a,y).
    Since the length of one side of the triangle is (2a-0)=2a, we can calculate the distance of (a,y) to (0,0) and equate to 2a accordingly.

    Using Pythagoras theorem,
    Solving for y:

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    posted by MathMate

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