MCQ
Assertion $(A) :$ A window has the shape of a rectangle surmounted by an equilateral triangle. If the perimeter of the window is $12 m$, then length $1.782 m$ and breadth $2.812 m$ of the rectangle will produce the largest area of the window.
Reason $( R )$ : For maximum or minimum, $f^{\prime}(x)=0$.
Reason $( R )$ : For maximum or minimum, $f^{\prime}(x)=0$.
- ✓Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A).$
- BBoth $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A).$
- C$(A)$ is true but $(R)$ is false.
- D$(A)$ is false but $(R)$ is true.
