Given that , complete the statements to show that △ABC ~ △DEF by the SAS similarity theorem. Horizontal and vertical lines are . So, angles are right angles by definition of perpendicular lines. All right angles are . Therefore, △ABC ~ △DEF by the SAS similarity theorem.

1. Perpendicular

2. B and E

3. Congruent

Step-by-step explanation:

Horizontal and vertical forms are identical to each other. The solution to the first distance is PERPENDICULAR.

Line BC is the horizontal line, line AB is the vertical one, and lines BC and AB are the opposite lines and thus angle B is the correct angle. Line EF is a horizontal line, line ED is a vertical line, the lines EF and ED are a perpendicular line and thus angle E is a right angle parallel. And the solution to the second choice is angles B and E.

The two right angles are congruent.

Having two sets of proportional sides and a couple of congruent adjacent angles, you can apply the Postulate SAS similarity.