Answer:
45°
Step-by-step explanation:
Corresponding parts of congruent triangles are congruent.
From the congruence statement, we know that ∠R≅∠L; since m∠R = 65, this means that m∠L = 65 as well.
We know that ∠S≅∠M; since m∠M = 70, this means that m∠S = 70.
This gives us two of the three angles of the triangle. The sum of the measures of a triangle is 180°; this gives us
65+70+x = 180
135+x = 180
Subtracting 135 from each side,
135+x-135 = 180-135
x = 45°
