Question

answer
scalene right equilnternal
isosceles acute isosceles obtuse
scalene acute scalene obtuse
isosceles right

Explanation:

1. Check for Isosceles: Two sides (ED and EC) are equal (both 4.92), so it's isosceles.
2. Check Angles for Acute/Obtuse: All angles (54°, 54°, 72°) are less than 90°, so acute.
3. Eliminate Other Options: Not scalene (two equal sides), not right (no 90°), not obtuse (all angles < 90°), not equilateral (sides not all equal).

Answer:

Isosceles Acute