ΔOAB का क्षेत्रफल क्या है, जहाँ O केंद्र है?

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संकल्पना:

I. यदि है, तो   है।

II. यदि  एक त्रिभुज की सन्निकट भुजाएं हैं, तो त्रिभुज का क्षेत्रफल निम्न द्वारा ज्ञात किया जाता है: 

गणना:

दिया गया है: ΔOAB में, जहाँ O केंद्र है, 

चूँकि हम जानते हैं कि, यदि  एक त्रिभुज की सन्निकट भुजाएं हैं, तो त्रिभुज का क्षेत्रफल निम्न द्वारा ज्ञात किया जाता है: 

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