Missing Angle: Adjacent Angles

Figure out the value of the missing angle using the fact that the sum of the two adjacent angles is equal to the angle formed by their non-common sides.

Choose the correct answer

Note: Adjacent Angles Theorem states that the sum of the measure of two adjacent angles is equal to the measure of the angle formed by its non-common sides.

Example: If angle AEC is 40° and angle DEC is 180° then what is angle DEA?

150°

140°

130°

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