Answer:
1.
a. BCA = 30 degrees.
b. BCD = 90 degrees.
c. Because D is in a corner that is equivalent to a right angle or 90 degree angle.
2.
a. LOK = 37 degrees.
b. LOM = 180 degrees.
c. It is obtuse because the angle is greater that 90 degrees and the protractor does not need to be moves. BTW the angle is 143 degrees.