Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 Engineering Mathematics Calculus Vector Calculus

उस त्रिभुज का क्षेत्रफल ज्ञात कीजिए जिसकी दो भुजाओं को सदिश 3i + 4j और 5i + 7j + k द्वारा दर्शाया गया है?

1
\(\sqrt {26}\over 2\)
2
\(\sqrt{26}\)
3
13
4
\(\sqrt{13}\over 2\)
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