Explanation:
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- ∠ AOE = a° , ∠EOD = 51° , ∠DOB = 90°
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:
~Set up an equation and solve for a :
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[ Sum of angle in a straight line ]
~Add the numbers : 51° & 90°
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~Move 141° to right hand side and change it's sign
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~Subtract 141° from 180°
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