Q. The triangular side walls of a flyover have been used for advertisements. The sides of the walls are $122m,22m$ and $120m$ (see figure). The advertisements yield an earning of $Rs.5000per{m}^2$ per year. A company hired one of its walls for $3$ months. How much rent did it pay?

Q. There is a slide on a park. One of its side walls has been painted in some colour with a message "KEEP THE PARK GREEN AND CLEAN" (see figure). If the sides of the wall are $15m,11m$ and $6m$, find the area painted in colour.

Q. A traffic signal board, indicating ${}^{\prime }SCHOOLAHEA{D}^{\prime }$, is an equivalent triangle with side '$a$'. Find the area of the signal board, using Heron's formula. If its perimeter is $180cm$, what will be the area of the signal board?

Q. Find the area of a triangle two sides of which are $18cm$ and $10cm$ and the perimeter is $42cm$.

Q. Sides of a triangle are in the ratio of $12:17:25$ and its perimeter is $540cm$. Find its area.

Q. An isosceles triangle has perimeter $30cm$ and each of the equal sides is $12cm$. Find the area of the triangle.

Q. Find the area of a quadrilateral $ABCD$ in which $AB=3cm$, $BC=4cm$, $CD=4cm$, $DA=5cm$ and $AC=5cm$

Q. A rhombus shaped field has green grass for $18$ cows to graze. If each side of the rhombus is $30m$ and its longer diagonal is $48m$, how much area of grass field will each cow be getting?

Q. A park, in the shape of a quadrilateral $ABCD$, has $\angle C={90}^o$, $AB=9m$, $BC=12m$, $CD=5m$ and $AD=8m$. How much area does it occupy?

Q. A field is in the shape of a trapezium whose parallel sides are $25m$ and $10m$. The non-parallel sides are $14m$ and $13m$. Find the area of the field.

Q. A floral design on a floor is made up of $16$ tiles which are triangular, the sides of the triangle being $9cm$, $28cm$ and $35cm$ (see figure). Find the cost of polishing the tiles at the rate of $50p$ per ${cm}^2$.

Q. Radha made a picture of an aeroplane with coloured paper as shown in Fig $12.15$. Find the total area of the paper used.

Q. An umbrella is made by stitching $10$ triangular pieces of cloth of two different colours (see figure), each piece measuring $20cm,50cm$ and $50cm$. How much cloth of each colour is required for the umbrella?

Q. A kite in the shape of square with a diagonal $32cm$ and an isosceles triangle of base $8cm$ and sides $6cm$ each is to be made of three different shades as shown in figure. How much paper if each shade has been used in it?

Q. A triangle and a parallelogram have the same base and the same area. If the sides of the triangle are $26cm,28cm$ and $30cm$ and the parallelogram stands on the base $28cm$, find the height of the paraollelogram.