Respuesta :

GeorgeBush123

Answer:

b) ∠4 = m∠U + m∠L

   ∠4 = 25° + 52°

   ∠4 = 77°

Step-by-step explanation:

a) Exterior Angle Theorem. The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles of the triangle.