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JAMB - Mathematics (1991 - No. 45)
In the figure above, find the value of y
28
o
122
o
150
o
152
o
Explanation
ADB = 180
o
- 152
o
= 28
o
28
o
+ y + 30
o
= 180
o
y = 180
o
- 58
o
= 122
o
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