Answer:
The measure of angle b (angle dbc) is

The measure of angle c is

The measure of angle d is

Explanation:
Let
x-----> measure of angle b (angle dbc)
y----> measure of angle c
z----> measure of angle d
Remember that
The sum of the internal angles of a triangle must be equal to 180 degrees
so
-----> equation A
-----> equation B
----> equation C
Substitute equation B and equation C in equation A and solve for y




Find the value of x

Find the value of z

The measures of each angle of the triangle are
The measure of angle b (angle dbc) is

The measure of angle c is

The measure of angle d is
