Describe and correct the error in classifying the triangle

all three angles need to be less than 90 degrees

Step-by-step explanation:

an acute triangle has 3 acute angles (less than 90 degrees). example: 60, 65, 55

1 is to a because corresponding angles are located in the same location, comparative to each line.

2 is to d because one, they are on the same side of the transversal, and two, they are "facing" each other.

3 is to c because vertical angles are formed opposite to each other when two lines intersect, like shown.

4 is to b because they are on different sides of the transversal, and are "facing" each other.

5 is to e because they are not "facing" each other, and they are on different sides of the transversal.