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3 cm त्रिज्या का एक वृत्त खींचें। वृत्त के केन्द्र से 5cm की दूरी पर स्थित बिन्दु से वृत्त पर दो स्पर्श रेखायें खींचें और उनकी लंबाइयाँ मापें।

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\(\because\) त्रिज्या स्पर्श रेखा पर लम्ब होती है।

इसलिए OT \(\perp\) AT अर्थात् ∠OTA = 90°

अब पाइथागोरस प्रमेंय का अनुपात

ΔΟΤΑ से,

OA2 = OT2 + AT2

52 = 32 + AT2

At= 52 - 32

= 25 - 9

= 16

\(\therefore \) AT = 4 cm

समान्तर AS = 4 cm

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