Move point B some more. As you move point B, the angle formed between A ⁢ B ↔ and C ⁢ D ↔ varies. If you want to make A ⁢ B ↔ perpendicular to C ⁢ D ↔ what do you need to do? Explain in terms of ∠ ⁢ B ⁢ E ⁢ C .

10 down (bang1)

5 up

5down (2)

2.5 up

2.5 down (3)

1.25 up

1.25 down (4)

now add them up : )

hoped i lol

question

given the diagram below, what is md?

the sum of the interior angles is 360°

take away from 360 the sum of the knows angles and you will have the angle d.

360 - 108 - 108 - 72 = 72°