To the mods of Your system is messed up. Academic questions have been deleted, and other important ones too. You delete answers that are academic, (I have answered math questions with just the number) It's like you don't even read them, you just delete what you want. You delete stupid answers to stupid questions (yet you don't delete the question)
Bottome line is, your system needs to be changed.

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.

add a picture or measurements so i cab