8th Grade: Use algebra to find the measure of the angles in the pair of complementary angles below. Show your work. I saw somebody already answered this question, but could somebody explain it a little more. Our teacher likes us to explain exactly how we got our answer :)

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap

What is the distance between the points (2, 5) and (5,9)?