Heron's formula UT
1. Find the area of a right-angled triangle whose base is 12 cm and height is 5 cm.
2. Find the area of an equilateral triangle with side 10 cm.
3. Find the area of an isoscles triangle with two equal sides as 5 cm each and the third side as 8 cm.
4. A triangular park has sides 120 m, 80 m and 50 m. A gardener has to put a fence all around it and also plant grass inside. How much area does he need to plant? Find the cost of fencing it with barbed wire at the rate of Rs. 20 per metre, leaving a space of 3 m wide for a gate on one side.
5. The sides of a triangular plot are in the ratio of 6 : 7 : 8 and its perimeter is 420 m. Find its area.
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