Answer:

Step-by-step explanation:
Let the three sides be a, b and c respectively.
Such that:



Required
Determine the area
This is calculated as:

Where

Substitute values for a, b and c



Substitute values for a, b, c and s in




-- Approximated
Answer:
Step-by-step explanation:
For every hour said student would've ran 3.5 km/hr
<h3>7/2</h3><h2>=3.5 kilometers per hour or 3 1/2 kilometers per hour</h2>
Ed because 2 and 8 are equal