Note:

Refer to the above diagram. and which other angle form a pair of corresponding angles?

Refer to the above diagram.

and which other angle form a pair of vertical angles?

Refer to the above figure. You are given that and . Which of the following statements would be sufficient to prove that is a right angle, given what is already known?

I)

II) and are both acute

III) is a right angle

Refer to the above diagram. and which other angle form a pair of alternate interior angles?