Two tangents
The figure shows a circle k with centre S and radius 5 cm, and a point A which is 13 cm from centre S. From point A, two tangents p and q are drawn to circle k, with points of tangency P and Q. In addition, another tangent t is drawn to circle k, intersecting tangents p and q at points B and C. What is the perimeter of triangle ABC? Write the perimeter as a number without a unit.
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