Answer: d=90 degrees
e=69 degrees
f=111 degrees
Step-by-step explanation:
69+f=180 ==> a straight line is 180 degrees and is called a straight angle. The angles that make up the straight line add up to 180 degrees.
69-69+f=180-69
f=180-69
f=111 degrees
e+f=180 ==> a straight line is 180 degrees and is called a straight angle. The angles that make up the straight line add up to 180 degrees.
e+111=180
e+111-111=180-111
e=180-111
e=69 degrees
d+90=180 ==> if there is a tiny box between an angle, that means that the angle is a right angle which measures 90 degrees.
d-90+90=180-90
d=180-90
d=90 degrees
