Question

The area bounded by y-axis, $x+y=1$ and $x-y=1$ is:

• A. $7.5$ square units
• B. $15.5$ square units
• C. $1$ square unit
• D. $75$ square units
• E. None of these

Answer 1

The correct option is D $75$ square units

Area of $△ABC=\frac{1}{2}\times BC\times AC$

$=\frac{1}{2}\left(\sqrt{1^2+1^2}\right)\left(\sqrt{1^2+1^2}\right)$

$=\frac{1}{2}\left(\sqrt{2}\right)\left(\sqrt{2}\right)=\frac{2}{2}=1sq.units$