Answer:
C. 100°
Step-by-step explanation:
If ΔABC ≅ ΔDEF then
- m∠A = m∠D = 50°
- m∠B = m∠E = 30°
- m∠C = m∠F
The sum of the interior angles of a triangle is 180°
Therefore, m∠A + m∠B + m∠C = 180°
⇒ 50° + 30° + m∠C = 180°
⇒ 80° + m∠C = 180°
⇒ m∠C = 180° - 80°
⇒ m∠C = 100°
