If angle 1 in the picture is 63°, what is the measure of angle 3? Why? (1 point) Responses Angle 3 is 63° because angle 1 and angle 3 are vertical angles. Angle 3 is 63 degrees because angle 1 and angle 3 are vertical angles. Angle 3 is 117° because angle 1 and angle 3 form a line. Angle 3 is 117 degrees because angle 1 and angle 3 form a line. There is not enough information in the figure to establish this. There is not enough information in the figure to establish this. Angle 3 is 63° because angle 1 and angle 3 are corresponding angles.
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The correct response is: Angle 3 is 117° because angle 1 and angle 3 form a line.
This is based on the fact that if angle 1 is 63°, then angle 3, which is a linear pair with angle 1, can be calculated as follows:
180° - 63° = 117°
Thus, angle 3 measures 117°.
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