What is the length of st? give how you solved this .

If a tangent segment and a secant segment are drawn to a circle from an exterior point, then the square of the measure of the tangent segment is equal to the product of the measures of the secant segment and its external secant segment (Intersecting Secant-Tangent Theorem)

so

ST²=RO*RT> ST²=23*7> ST²=161

ST=√161> ST=12.69 in

the answer is

ST=12.69 in