Answer: A. scalene
Explanation:
scalene = all three sides have different lengths
isosceles = two of the sides have the same length
equilateral = all three sides have the same length
AE = 5 (2.5 + 2.5)
ED = 3
AD = 7
Since all three sides have different lengths, it is a scalene triangle.
********************************************************************************
If it is a right triangle, then 3² + 5² = 7²
9 + 25 = 49
34 ≠ 49 so it is not a right triangle