1.

XY and XZ are tangents to a circle, ST is another tangent to the circle at the point R on the circle, which intersects XY and XZ at S and T respectively. If XY = 15 cm and TX = 9 cm, then RT is

A. 4.5 cm
B. 7.5 cm
C. 6 cm
D. 3 cm
Answer» D. 3 cm


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