When lines intersect they formed angles. angles are the spaces or shapes form between intersecting lines. In this problem they want us to find the angles c and b.
In this problem are two lines which intersect, this intersection creates 4 angles.
Answer: Angles B and C are 71 degrees.
Step by step explanation: Angles b and c are vertical angles, therefore they will be the same amount. One of the angles is given, which is 109. Knowing that a straight angles is 180 degrees, we can subtract 180 from 109 to get the answer.
180-109= 72 degrees.
You can double check by adding 72 to 109, which gives you 180.
Hope this helps!