Final answer:
If two sides of two adjacent acute angles are perpendicular, then the angles are complementary.
Step-by-step explanation:
In a two-column proof, we can show that if two sides of two adjacent acute angles are perpendicular, then the angles are complementary:
- Let angle A and angle B be the two adjacent acute angles.
- Given that the two sides of angle A and angle B are perpendicular, we have a right triangle.
- In a right triangle, the sum of the two non-right angles is 90 degrees.
- Therefore, angle A and angle B are complementary angles.