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Ppapapetrou · Answer 1 · 2019-09-03T22:46:29+0000

Answer:

$\displaystyle\boxed{60^(\circ)}$

Explanation:

The vertical angles at E are the same and are included in both triangles ABE and CDE. Since the sum of angles of a triangle is 180°, the sum of the angles at A and B will match the sum of the angles at C and D. That is, when either sum is added to the angle at E, the result will be 180°.

A = (C+D)-B = (43 +35 -18)°

A = 60°

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