Answer:
A, C, and E are isosceles but not equilateral, B is scalene, and D is equilateral.
Explanation:
You need to know the definitions of scalene, isosceles, and equilateral triangles. Scalenes have no congruent sides, isosceles have at least two congruent sides, and equilaterals have all three sides congruent. The lines or tick marks on sides represent that they are congruent to the other sides with that mark. Thus, A, C, and E are isosceles but not equilateral, B is scalene, and D is equilateral.