1 Answer

Christopher Lee · Answer 1 · 2017-03-01T04:20:52+0000

1. vertical angle theorem and triangle angle sum theorem

2. The sum of the interior angles of a triangle = 180
so < x = 180 - (70 + 30) = 180 - 100 = 80
and < y is a vertical angle to < x...and vertical angles are equal..
so < y = 80

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