A circular mirror of radius $21 \mathrm{cm}$ is surrounded by a circular frame of width $3.5 \mathrm{cm}$. Find the cost of making the frame at $₹1.50$ per ${\mathrm{cm}}^2$. [Take $\pi =\frac{22}{7}$]

If the length and the width of a rectangle are each doubled, by what percent is the area increased?

In a square garden of side $3.5 m$, four flower beds were laid out as shown. The remaining area of the garden is $7.25 m^2$. If all the flower beds are of the same size, find the length of each if the breadth of each flower bed is $50 cm$.

A table top, in the shape of a parallelogram was polished, which costs $20 per 10 c{m}^2$. If the base of the parallelogram is $45 cm$ and the total cost was $₹2250$, find the altitude of the parallelogram.

Find the area of the quadrilateral $ABCD$ given that $BD=12 cm,AM\perp BD, CN\perp BD, AM=6.2cm, CN=10.8cm$..

A circle with centre at $O$ and radius $3.5 cm$ is inscribed in the triangle $ABC$. Find the area of the shaded region in the given figure.

A rectangular piece of paper was folded to form the shape shown. What was the area of the piece of paper before it was folded?

In triangle ABC, as shown in figure, find the area of triangle ADC.