Correct option is (C) 4 (x + y – z)
Let side length of the square be a unit.
\(\therefore a^2=x^2+y^2+z^2+2xy-2yz-2zx\)
\(=x^2+y^2+(-z)^2+2\times x\times y\) \(+2\times y\times -z+2\times -z\times x\)
\(=(x+y-z)^2\) sq. units
\(\Rightarrow\) \(a=(x+y-z)\) unit
\(\therefore\) Perimeter of the square =...
Correct option is (C) 1
Area of flag \(=\frac12\times\) Base \(\times\) Height
\(=\frac12\times(2+\sqrt2)\times(2-\sqrt2)\)
\(=\frac{4-2}2\) = 1 square units
