geometry/proofs help! medal and fan

Question

anonymous · Answer

attachment

michele_laino · Answer

Please, first you have to verify that: 1) measure CD = measure AD and,
2) measure CE = measure EB
after that there is a theorem which states that if the above measures are eqauls in the way as I have indicated, then DE is parallel to AB.

anonymous · Answer

so how would i put it as an answer? @Michele_Laino

michele_laino · Answer

Since that condition1) and condition 2) are true, then the thesis is true, please check the conditions 1) and 2) first

anonymous · Answer

what?

anonymous · Answer

can u just give me the answer? @Michele_Laino

michele_laino · Answer

the answer is implied by your reasoning, whose steps I indicated as 1) and 2)

michele_laino · Answer

for example: the measure of CD, is the distance between the points C and D, to find this distance, please you have to apply the usual formula, do you know that formula?

michele_laino · Answer

for example distance between C and D is:
$$dist(C,D)=\frac{ \sqrt{x_{1}^{2}+y _{1}^{2}} }{ 2 }$$

anonymous · Answer

oh okay i got it thanks!