Prove δabc ~ δgef.

me with this question, i would really appreciate it!
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From what you have given, there isn't a way to solve the problem. There has to be something more.  Like angles and/or sides being equal to each other.  From the diagram, I am guessing that is it base off of the lower part of the triangle and the final part would have to do with corresponding parts of congruent triangles are congruent.

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle