Answer: a) AE║BC
b) CD and DE
c) AB⊥AE, AB⊥BC
Step-by-step explanation: The arrow in AE and BC means they are parallel. The hash mark in CD and DE means they are the same length. The little "L" in the corner (A and B) means the angle is 90°, which AB and AE are perpendicular, AB and BC are perpendicular.