man runs 11 miles, turns and walks 9 miles, turns again and runs 6 miles returning to his starting point. What is the area of the triangle formed by his path?

Answer 1

Use Heron's formula

Area = sqr[(13)(2)(4)(7) = sqr628 = about 25

find the average perimeter = 13

multiply it by the difference of 13 and each side: (13)(13-11)(13-9)(13-6) = 13(2)(4)(7)

take the square root. square root of 728 = almost 27