Answer
The possible answers include
12 miles
16 miles
14 miles
24 miles
18 miles
26 miles
Explanation
If the three sides in a triangle are a, b and c with c being the longest side, it should be noted that if the longest side is equal to or more than the sum of the two sides, c ≥ a + b, the triangle is not possible.
So, for this question where two of the sides of the triangle are already 8 miles and 20 miles, the third side *let it be x) can only be between
(20 - 8) < x < (20 + 8)
12 < x < 28
So, all the answers between 12 and 28 will form a practical triangle.
The possible answers include
12 miles
16 miles
14 miles
24 miles
18 miles
26 miles
Hope this Helps!!!
