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Hindi
9.Straight Line
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સંયુક્ત સમીકરણ $y = |x|$ વાળા બે કિરણો અને રેખા $x + 2y = 2$ દ્વારા બનતા ત્રિકોણનું ક્ષેત્રફળ :

A

$\frac{8}{3}$ એક્મ ${^2}$

B

$\frac{4}{3}$ એક્મ ${^2}$

C

$4$ એકમ${^2}$

D

$\frac{{16}}{3}$ એક્મ${^2}$

Solution

The lines are $y=x, y=-x$ and $x+2 y=2$

Solving $y=x, x+2 y=2$ the point $A\left(\frac{2}{3}, \frac{2}{3}\right)$

Therefore $OA =\sqrt{\frac{4}{9}+\frac{4}{9}}=\frac{2 \sqrt{2}}{3}$

Solving $y=-x, x+2 y=2$, the point $B(-2,2)$

Therefore $OB =\sqrt{4+4}=2 \sqrt{2}$

Now area of $\triangle OAB =\frac{1}{2} \times OA \times OB =\frac{1}{2} \times \frac{2 \sqrt{2}}{3} \times 2 \sqrt{2}=\frac{4}{3}$

Standard 11
Mathematics

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