Question

Write an essay : Write an indirect proof proving that only one angle of an obtuse is greater that 90

Answer 1

You mean "only one angle of an obtuse TRIANGLE..." (you left out "triangle", i think)

Answer 2

Assume we have an obtuse triangle. That means it has an angle that is obtuse...or greater than 90 degrees. What if our triangle has 2 angles greater than 90 degrees? If we add these 2 angles together, we would get a sum greater than 180 degrees. But that is impossible, since all 3 angles of a triangle must add up to 180. It is impossible for 2 angles in a triangle to sum to a total greater than 180. Therefore, only 1 angle in a triangle can be obtuse and no MORE than one angle.

Answer 3

@BangkokGarrett can you help me with another ?

Answer 4

Prove the diagonals of a parallelogram bisect one another. Be sure to create and name the appropriate geometric figures.