okay guys so this question is for user 8782723 on and I know I couldn't answer the question but it's not letting me answer any questions and all those questions that I asked or wrong plus I tried to answer your question and it just gave a whole bunch of dots so so I'm just going to tell you the answer here so it's the pressure of the gases in the magma plus the new batch of magma ready to fill to the top that causes it to push out ​

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