Explanation:
Let assume as a=x, b=x, c=xand d=x
X+x+x+x+51+53=360 (sum of angles in circle)
4x+104=360
4x=360-104
4x/4=256/4
X=64
The values of the unknown angels =64
PROVE
64+64+64+64+104=360
256+104=360
360=360
'a' is equal to the angle opposite it = fifty one
'c' " " " " " " " = fifty three
'd' and 'b' are equal
'c' 'd' and 'a' form a straight line = 180
fifty three + fifty one + d = 180 shows d = seventy six degrees
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