It is a right angle triangle and angle A measures 15 degrees.
15 degrees
It is: 15 degrees
105 degrees
In a parallelogram adjacent angles are supplementary, so angles are 75 degrees (A & C) and 105 degrees (B & D).
They are: 75 degrees + 15 degrees = 90 degrees
15 degrees
180-75=105 degrees
It is 75 degrees
It is: 15 degrees
The sum of an angle and its complement is 90 degrees. So the unknown angle must be 90 - 75 = 15 degrees.
The supplementary angle of 57 degrees is 123 degrees The complementary angle of 75 degrees is 15 degrees So: 123 minus 15 = 108 degrees
It is: 180-75 = 105 degrees
75 degrees
105 degrees
180-105 = 75
105 degrees
The third angle is 68 degrees which makes it a scalene triangle