Answer:
63.3 sq.ft.
Step-by-step explanation:
The three sides of the given triangle have lengths are 15 ft. (say, a), 20 ft. (say, b) and 9 ft. (say, c).
Now we have to calculate the triangle area.
So, the half perimeter of the triangle will be, [tex]s = \frac{a + b + c}{2} = \frac{15 + 20 + 9}{2} = 22[/tex]
Now, we know the area of the triangle is given by
[tex]\sqrt{s(s - 20)(s - 15)(s - 9)} = \sqrt{22 \times 2 \times 7 \times 13} = 63.3[/tex] sq. ft. (Answer) {Approximate}
