In the equilateral ABC, AB = 12. One vertex of a square is at the midpoint of the side BC, and the two adjacent vertices are on the other two sides of the triangle. The length of a side of the square may be expressed as where p and q are integers. The ordered pair (p, q) is
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Using sine law in Δ BME,
=
=
p = 9, q = – 3
⇒ (9, – 3).
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