If PT is a tangent and AB is a chord of circle and they intersect at the point P externally and 2PT = AP and AB = 18 units, then PT is equal to- यदि PT एक स्पर्शरेखा है और AB वृत्त की एक जीवा है और वे बाह्य बिंदु P पर एक दूसरे को प्रतिच्छेदित करती हैं और 2PT = AP और AB = 18 इकाई, तो PT बराबर है

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