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.5000perm2 per year. A company hired one of its walls for 3 months. How much rent did it pay?

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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.

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Q. A traffic signal board, indicating ′SCHOOLAHEAD′, 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?

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

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

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

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

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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?

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

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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.

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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 cm2.

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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.

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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?

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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?

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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.