Question

In the diagram below of triangle BCD , side DB is extended to point A

which statement must be true ?

1) mmmm 12 years ago

Answer 1

4) m<ABC>m<C+m<D

Answer 2

@DSS That is incorrect since the exterior angle of a triangle is equal to the sum of the two remote interior angles.

Answer 3

We know that <ABC is supplemental to the other side of <B. Don't we also know that the two triangles inside the triangle should equal <ABC because <ABC and the other side of <B = 180?