in δrst, \text{m}\angle r = (6x 10)^{\circ}m∠r=(6x 10) ∘ , \text{m}\angle s = (2x 5)^{\circ}m∠s=(2x 5) ∘ , and \text{m}\angle t = (3x-11)^{\circ}m∠t=(3x−11) ∘ . find \text{m}\angle r.m∠r.