Practicing Success
Find the area of the parallelogram whose adjacent sides are determined by the vector \(\vec{a}\) = \(\hat{i}\) - \(\hat{j}\) +3 \(\hat{k}\) and \(\vec{b}\) = 2\(\hat{i}\) - 7\(\hat{j}\) + \(\hat{k}\)
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17√2 units 15√2 units 19√2 units 21√2 units |
15√2 units |
The area of the parallelogram whose adjacent sides are the vector \(\vec{a}\) and \(\vec{b}\) is |\(\vec{a}\)x\(\vec{b}\)| Adjacent sides are given as: \(\vec{a}\) = \(\hat{i}\) - \(\hat{j}\) +3 \(\hat{k}\) and \(\vec{b}\) = 2\(\hat{i}\) - 7\(\hat{j}\) + \(\hat{k}\) \(\vec{a}\)x \(\vec{b}\) = (\(\hat{i}\) - \(\hat{j}\) +3 \(\hat{k}\)) x (2\(\hat{i}\) - 7\(\hat{j}\) + \(\hat{k}\)) \(\vec{a}\)x \(\vec{b}\) = (-1+21)\(\hat{i}\) - (1-6) \(\hat{j}\) + (-7+2) \(\hat{k}\) \(\vec{a}\)x \(\vec{b}\) = 20\(\hat{i}\) +5 \(\hat{j}\) -5 \(\hat{k}\) |\(\vec{a}\)x \(\vec{b}\)| = √(20)2 +(5)2 +(-5)2 =15√2 Hence the area of the parallelogram = 15√2 units
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