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दिये गये चित्र में 0 केन्द्र वाले एक वृत्त के  बिन्दु A पर PAQ एक स्पर्शी है तथा ∠BAQ = 60° तब ∠ABC का मान ज्ञात कीजिए।

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∠ACB = ∠BAQ = 60° (एकान्तर वृत्त खण्ड के कोण बराबर होते हैं।)

∠BAC = 90° (अर्द्धवृत्त में बना कोण समकोण होता है।)

∠ACB + ∠BAC + ∠ABC = 180°

∴ ∠ABC = 180° – (∠ACB + ∠BAC)

= 180° – (60° + 90° )

= 180° -150°

= 30°

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