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एक समांतर चतुर्भुज की संलग्न भुजाएं 2hat...

एक समांतर चतुर्भुज की संलग्न भुजाएं `2hati-4hatj+5hatk` और `hati-2hatj-3hatk` है। इसके विकर्ण के समांतर एक मात्रक सदिश ज्ञात कीजिए। इसका क्षेत्रफल भी ज्ञात कीजिए।

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