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

Find the area of triangle whose two sides are represented by the vectors 3i + 4j and 5i + 7j + k is 

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