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दिये गये चित्र में, वृत्त के बिन्दु A पर PAT एक स्पर्शी है। BC वृत्त का व्यास P है तथा ∠ ABC = 30° तब ∠ PAB व ∠ TAC के मान ज्ञात कीजिए।

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∆ ABC में,

∠ BAC = 90° [अर्द्धवृत्त में बना कोण समकोण होता है।]

∠ ACB = 180° – (30° + 90°)

= 180° – 120° = 60°

∴ ∠ PAB = ∠ ACB = 60° (एकान्तर वृत्तखण्ड के कोण)

∠ TAC = ∠ABC = 30° (एकान्तर वृत्तखण्ड के कोण)

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