Question

Does anyone know how to do this? It's the angle sum theorem.

Answer 1

90 degrees

Explanation:

the 110 angle+the inside angle will be 180 degrees, so 180-110=70. The other triangle has the same angle, since the bisector will create a side that is the same, it proves how the triangle are the same, and the bisector creates a 90 degree angle, or a right angle.