Answer:
Step-by-step explanation:
for the first one the angle is B, the arms of the angle are BC and AB and the vertex is B the type of angle is a right angle 90 degrees
for the second the angle is C, the arms of the angle are CB and CD and the vertex is C the type of angle is a right angle 90 degrees
For the third the angle is D the arms of the angle are DC and DE and the vertex is D the type of angle is an Obtuse angle which is greater than 180 degrees.
For the forth one the angle is E the arms of the angle are ED and EF and the vertex is E the type of angle is an acute angle which is less than 180 degrees.
