Area with Herons Formula
Area with Herons Formula
Heron's Formula : In some cases, length of each side of the triangle are given but height of the triangle is neither given nor we are able to find in any way, then to find the area of such type of triangle, we use Heron's formula which is given below.
Area of triangle = , where a,b,c are length of the sides of a triangle and s is the semi-perimeter of the triangle i.e.
Example: 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. Solution : We divide the quadrilateral ABCD in two triangle ABC and ACD For Area ( = Similarly, for a = 5 cm, b = 5 cm, c = 4 cm and s = Area ( =
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A triangular park ABC has sides 120 m,80m and 50 m.A gardener has to put a fence all around it and also plant grass inside.Find the area of garden and cost of fencing the garden with barbed wire at the rate of Rs 20 per metre leaving a space 3 m wide for a gate on one side are | |||
| Right Option : A | |||
| View Explanation | |||
If the sides of a triangle are doubled, then its area ______________. | |||
| Right Option : D | |||
| View Explanation | |||
If every side of a triangle is doubled, then increase in the area of the triangle is _________________ | |||
| Right Option : A | |||
| View Explanation | |||
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