Ireally really need with proving this using a two column proof:

given: line ac bisects angle bcd
given: angle abc is congruent to angle adc

prove: line ab is congruent to line ad

i've been trying to figure this out for so long but i seriously can't seem to figure out how to prove the two lines are congruent.

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.