<span>Which angle do you want?</span>
Answer:

Step-by-step explanation:
2p + 3r = q
2p + 3r - 3r = q - 3r [ subtract 3r from both sides ]
2p + 0 = q - 3r [ -3r + 3r = 0 ]
2p = q - 3r
[ divide by 2 on both sides ]

the answer is 18 yes you are correct
let's recall that the sum of all interior angles in a triangle is 180°.
an equi-lateral, equal sides, triangle has all sides that are equal.
sides that are equal will yield an equal opposite angle.
so if all sides are equal, all angles are equal, for a sum of 180°, that's only possible with 60°, 60° and 60° angles, and all of them are acute, none obtuse.