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सिद्ध कीजिए कि बिन्दु (1, 2), (3, 3) व (-1, 1) संरेख हैं।

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∆ का क्षेत्रफल = 1/2[(3 + 3 – 2) – (6 – 3 + 1)]

= 1/2[4 – 4] = 0 वर्ग इकाई

∵ ∆ का क्षेत्रफल 0 है, 

∴ तीनों बिन्दु संरेख होंगे।

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