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3 years ago

9

Triangle sum theorem.

1 answer:

pychu [463]3 years ago

4 0

60 because in triangle ecd d is 35 and c is 43 together they are 78 so the angle that is left is equal to 102 (180-78)
Now in triangle abe the two known angles are 18 and 102 ( vertically opposite angle ) and 18+102 is equal to 120
A= 180-120 =60

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