Perimeter and A...

A bicycle wheel has diameter 1m. If the bicycle travels one kilometer, then the number of revolutions the wheel make is.

In the figure shown here, $$BDEC$$ is a rectangle. $$ABC$$ and $$DEF$$ are straight lines. The area, in cm$$^2$$ , of the whole figure is ______ .

The areas of two concentric circles forming a ring are 154 sq. cm and 616 sq. cm. The breadth of the ring is

The perimeter of circle is $$\displaystyle \pi $$ cm, then the area

The cost of fencing a circular field at the rate of Rs. 12 per meter is Rs. 1320. The field is to be ploughed at Rs. 2 per $$\mathrm {m^{2}}$$, then cost of ploughing is: $$\displaystyle \left ( \text{use }\pi =\frac{22}{7} \right )$$

Four circular cardboard pieces, each of radius 7 cm are placed in such a way that each piece touches the two other pieces. The area of the space enclosed by the four pieces is:

One side of a parallelogram is $$8 \ cm$$. If the corresponding altitude is $$6\  cm$$, then its area is given by

The perimeter of sheet of paper in the shape of a quadrant of a circle is 25 cm , then area of the paper is

A race track is in the form of a ring whose inner circumference is $$440 \ \mathrm{m} $$ & outer circumference is $$506 \ \mathrm{m}$$ The width of the track is:

If the radius of the circle is increased by $$100%$$, then the area is increased by