Question

give me ....
your answer​

Answer 1

Answer:

use the law of reflection angle of incident is equal to angle of reflection

Answer 2

At CA the angle of Incidence is equal to angle of Reflection ..

same at DB at both sides .

so of the exterior angles are equal then Interior must be equal(

(so angle 4+3=2+1)

if they are equal they mist be 90°.

so they areparallel.