Brainiest answer to whoever is first

Which of the following are accepted without proof in a logical system? check all that apply.

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).