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यदि समांतर चतुर्भुज का संलग्न भुजाओं को ...

यदि समांतर चतुर्भुज का संलग्न भुजाओं को सदिशों `hati-2hatj+3hatk` और `4hati+hatj-8hatk` से प्रदर्शित करें, तो उसका क्षेत्रफल ज्ञात कीजिए ।

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