Find the capacity in litres of cylindrical well of 1 metre and depth 14cm. 

Find the angle subtends at the centre of a circle by a chord which is equal in length to the radius of the circle.

Find the area of the figure above

In the diagram above $\angle OPQ$is

Find the exterior angle of a 12 sided regular polygon

In the diagram above $PQ\parallel RS$, the size of the angle marked x is

If $\left( \begin{matrix}   -2 & 1  \\   2 & 3  \\\end{matrix} \right)\left( \begin{matrix}   p & q  \\   r & s  \\\end{matrix} \right)=\left( \begin{matrix}   1 & 0  \\   0 & 1  \\\end{matrix} \right),$what is the value of r

Find the value of x and y respectively if $\left( \begin{matrix}   1 & 0  \\   -1 & -1  \\   2 & 2  \\\end{matrix} \right)+\left( \begin{matrix}   x & 1  \\   -1 & 0  \\   y & -2  \\\end{matrix} \right)=\left( \begin{matrix}   -2 & 1  \\   -2 & -1  \\   -3 & 0  \\\end{matrix} \right)$

A binary operation on the set of real numbers excluding –1 is such  that, for all m, n $\varepsilon $ R, $m\Delta n=m+n+mn$. Find the identity element of the operation

A binary operation * defined on the set of positive integer is such that that $x*y=2x-3y+2$ for all positive integers x and y. The binary operation is