Assume that the lines de and xy intersect as in the diagram below. which of the following statements are true

ACD <<<< answer
There are three answers that are true.

B
The problem with B is that complementary angles are 2 angles that are related in such a way that they two angles add to 90o. That means that there are a couple of things wrong. First of all the two angles are on opposite sides of the vertical line XY. That makes them vertically opposite. Secondly, they add up to 180 since both of the are right angles. Third the only point they have in common is the intersection point at A.

The other 3 statements are all correct.

Thanks for revising your question.

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