State the postulate or theorem that justifies each statement
Given: c ll d
1.) ∠5 ≅ ∠7
corresponding angles are equal
2.) ∠3 ≅ ∠6
alternate-interior angles are equal
3.) m∠6 + m∠7 = 180
consecutive interior angles are supplementary
4.) b
d
two lines in a plane perpendicular to the same line
I'm really lost, can someone please explain to me how this is done?