Answer:
A) The vertex of CDH would be point D.
B) The sides of CDH would be CD & HD.
C) Classify CDH as an acute angle.
Explanation:
A) Those are just where they meet in the middle, and D is the middle point of CDH.
B) Those are literally just the sides.
C) There's acute, obtuse, right etc. angles. Acute angles are less than 90 degrees. And your angle is definitely less than 90.