A tailor cut a semi-circular portion of cloth from a rectangular piece as shown in the figures below. The measurements of cloth are given along with the Figure $\left(\mathrm{i}\right)$.

What is the perimeter of the cloth in Figure $\left(\mathrm{ii}\right)$?

Manju made a design for rangoli using four circular arcs of radius $r$, leaving an empty square inside as shown in the figure below. The centres of the circles are the vertices of the square.

Which of the following is the perimeter of the shape above?

$15$ circles are arranged in a rectangular frame of length $25 \mathrm{cm}$ as shown in the figure below. The vertices of the triangle are at the centres of circles.

What is the area of the shaded triangle?

Seema took circular cardboard $\left(A\right)$ of area $500 {\mathrm{cm}}^2$ and then form it, she cut and removed a small circle $\left(B\right)$ to get the shaded area as shown in the figure below. The circle $B$ passes through the centre of the circle $A.$

What is the remaining area of the cardboard $A$ (the region shaded in grey)?

A satellite has a circular orbit $800 \mathrm{km}$ above the earth's equator. The radius of the earth is $6400 \mathrm{km}$ and the satellite must complete exactly $14$ revolutions in a day.What is the speed of the satellite?   Use $\left(\mathrm{\pi }=3.14\right)$

The figure below is the marking made on a sports ground of a school. 

Which of these paths shorter between $A$, and $E$, $ACE$ or $ABDE$?

A farmer fences $400 \mathrm{m}\times 300 \mathrm{m}$ field with $4-$strand wire fence.

What is the cost of the wire if one strand of wire costs $₹10$ per metre.