Sides of a triangular field are 15 m, 16m and 17m. With the three corners of the field a cow, a buffalo and a horse are tied separately with ropes of length 7m each to graze in the field. Find the area of the field which cannot be grazed by the three animals.

Explanation

To solve the problem, we need to find the area of the triangular field that cannot be grazed by the three animals tied at the corners with ropes of length 7 meters each. Here’s a step-by-step solution:

### Step 1: Calculate the Area of the Triangular Field
We can use Heron's formula to find the area of the triangle. First, we need to calculate the semi-perimeter (s) of the triangle.

The sides of the triangle are:
- a = 15 m
- b = 16 m
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