T= C(7+AB)
T = 7C + ABC
T - 7C = ABC
(T - 7C)/BC = A
if you need to simply 12/ c^-8 d^2=
=12 c^8/d^2
is the third choice
The Third Angle Theorem states if two angles are congruent to two angles in another triangle, the third angles are congruent too. Because a triangle has <span><span><span>180 degrees </span></span></span>the third angle in any triangle is <span><span><span>180 degrees </span></span></span>minus the other two angle measures