1. Draw a coordinate plane.

2. Use the origin as vertex *C* of the triangle *CDE*.

3. Place the base of the triangle along the positive *x*- axis.

4. Position the triangle in the first quadrant.

5. Since *D* is on the *x*-axis, its *y*-coordinate is 0.

Its *x*-coordinate is *a* because each side has length *a* units.

6. Triangle *CDE* is an equilateral triangle, so the *x*-coordinate of *E *is halfway between 0 and

*a* that is .

7.Since is an equilateral triangle, *y*-coordinate of *E* is *a* units.

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