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2-86.
Sketch an equilateral triangle. Label the angles and sides.
Drop a perpendicular height from C to the base AB.
What kind of a triangle is ΔCDB?
How long is DB?
Using the Pythagorean Theorem, find the height 'h'.
30° 60° 90° triangle
6 cm.
Finally, find the area of the triangle multiplying half the height times the base.