ધારો કે $\overrightarrow{a}, \overrightarrow{b}, \overrightarrow{c}$ એ $\triangle ABC$ ના શિરોબિંદુઓ $A, B, C$ ના સ્થાન સદિશો છે. $\triangle ABC$ નું સદિશ ક્ષેત્રફળ શું છે?

  • A
    $\frac{1}{2}\{\overrightarrow{a} \times(\overrightarrow{b} \times \overrightarrow{c})+\overrightarrow{b} \times(\overrightarrow{c} \times \overrightarrow{a})+\overrightarrow{c} \times(\overrightarrow{a} \times \overrightarrow{b})\}$
  • B
    $\frac{1}{2}\{\overrightarrow{a} \times \overrightarrow{b}+\overrightarrow{b} \times \overrightarrow{c}+\overrightarrow{c} \times \overrightarrow{a}\}$
  • C
    $\frac{1}{2}\{\overrightarrow{a}+\overrightarrow{b}+\overrightarrow{c}\}$
  • D
    $\frac{1}{2}\{(\overrightarrow{b} \cdot \overrightarrow{c}) \overrightarrow{a}+(\overrightarrow{c} \cdot \overrightarrow{a}) \overrightarrow{b}+(\overrightarrow{a} \cdot \overrightarrow{b}) \overrightarrow{c}\}$

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જો $\bar{a}=2\hat{i}+3\hat{j}-\hat{k}$,$\bar{b}=-\hat{i}+2\hat{j}-4\hat{k}$ અને $\bar{c}=\hat{i}+\hat{j}+\hat{k}$ હોય,તો $(\bar{a} \times \bar{b}) \cdot(\bar{a} \times \bar{c})=$

$r \times a = b \times a;\,\,r \times b = a \times b;\,\,a \ne 0;\,\,b \ne 0;\,\,a \ne \lambda b;\,\,a$ એ $b$ ને લંબ નથી,તો $r = $

કોઈપણ સદિશ $\vec{a} \in \mathbb{R}^3$ માટે,$|\vec{a} \times \hat{i}|^2 + |\vec{a} \times \hat{j}|^2 + |\vec{a} \times \hat{k}|^2 = $ . . . . . . .

જો $|\vec{a}|=3$ હોય,તો $|\vec{a} \times \hat{i}|^2+|\vec{a} \times \hat{j}|^2+|\vec{a} \times \hat{k}|^2$ નું મૂલ્ય . . . . . . છે.

સદિશો $\bar{a}+\bar{b}$ અને $\bar{a}-\bar{b}$ બંનેને લંબ એકમ સદિશ શોધો,જ્યાં $\bar{a}=\hat{i}+\hat{j}+\hat{k}$ અને $\bar{b}=3 \hat{i}-2 \hat{j}+5 \hat{k}$ છે.

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