If in a triangle,the area is numerically equal to the perimeter,then the radius of the inscribed circle of the triangle is

$A$ triangle and a parallelogram are constructed on the same base such that their areas are equal. If the altitude of the parallelogram is $100 \, m$,then the altitude of the triangle is

What is the area of the shaded portion if each side of the square measures $21\,cm$? (in $cm^2$)

Each side of an equilateral triangle is increased by $1.5 \%$. The percentage increase in its area is......$\%$

The perimeter of an isosceles right-angled triangle is $2p \, cm$. Its area is

Water flows out at the rate of $10 \, m/min$ from a cylindrical pipe of diameter $5 \, mm$. Find the time taken to fill a conical tank whose diameter at the surface is $40 \, cm$ and depth is $24 \, cm$ (in $min$)?