Find the area of an equilateral triangle whose perimeter is 60 cm. (Using Heron's formula).

3

(a)

(a) Find the area of the triangle.

(b) Find the area of a triangle whose sides are 16 cm, 14 cm, nd 10 cm.
(c) The sides of a triangle are 7 cm, 12 cm, and 13 cm. Find its area. 
 d) Find the area of a triangle whose sides are 11 m, 60 m and 61 m.

3

(a)

The sides of a triangle are in the ratio of 25: 17: 12 and its perimeter is 1080 cm. Find its area.

3

(a)

The lengths of the sides of a triangle are in the ratio 3: 4: 5 and its perimeter is 144 cm. Find the area of the triangle.

3

(a)

Sides of a triangle in the ratio 5:12:13 and its perimeter is 120 cm. Find its area.

3

(a)

The perimeter of a triangle of a rhombus is 52 cm. One of the diagonals is 24 cm, find the area of the rhombus.

3

(a)

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

3

(a)

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

3

(a)

A floral design on a floor is made up of 16 tiles which are triangular, the sides of the triangle being 9 cm, 28 cm, and 35 cm. Find the cost of polishing the tiles at the rate of 50 p per cm² .

3

(a)

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

3

(a)

A rhombus-shaped field has green grass for18cows to graze. If each side of the rhombus is 30 m and its longer diagonal is 48 m, how much area of grass field will each cow be getting?

3

(a)

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

3

(a)