A CIRCLE IS TANGENT TO A LINE AT A. FROM A POINT P ON THE CIRCLE, A...

4. - ĐỀ THI TOÁN QUỐC TẾ PMWC VÒNG CÁ NHÂN
Toán ĐỀ THI TOÁN QUỐC TẾ PMWC VÒNG CÁ NHÂN

4. A circle is tangent to a line at A. From a point P on the circle, a line is drawn

such that PN is perpendicular to AN. If PN = 9 and AN = 15, determine the radius

of the circle.

P

A

N

Answer :