Perimeter and A...

$$ABCD$$ is a square field of side $$80\;m$$. If $$EF$$ is perpendicular to $$DC$$, find the area of $$\Delta EDC$$ and the area of the shaded portion respectively.

Mrs. Kaushik has a square plot with the measurement as shown in the figure. she wants to construct a house in the middle of the plot. A garden is developed around the house. Find the total cost of developing a garden around the house at the rate of $$Rs.\;55\;per\;m^2$$.

In figure, $$AB$$ and $$CD$$ are two perpendicular diameters of a circle with centre $$O$$. If $$OA$$$$=$$$$7cm$$, find the area of the shaded region. [Use $$\pi=\displaystyle\frac{22}{7}$$]

If the diameter of a semicircular protractor is $$14cm$$ then find its perimeter.

The area of the shaded portion in the given figure is

A circular ground whose diameter is $$140$$ meters is to be fenced by wire three times around its circumference. Find the length of wire needed.

$$[$$use $$\displaystyle \pi = \frac {22}{7}$$$$]$$

The inner circumference of a circular tracks is $$220\ m$$. The track is $$7$$ $$m$$ wide everywhere. Calculate the cost of putting up a fence along the outer circle at the rate of Rs. $$2$$ per metre. Use $$\pi=\displaystyle\frac{22}{7}$$

The radii of two circles are $$8$$cm and $$6$$cm respectively. Find the radius of the circle having its area equal to the sum of the areas of the two circles.

If the radius of circle is $$\displaystyle \pi $$, then its area will be:

Find the area of a circle whose circumference is $$22cm$$.