If angle 1 in the picture is 63°, what is the measure of angle 3? Why?

I'm sorry, but without the picture or any additional information, we cannot determine the measure of angle 3. To find the measure of angle 3, we need more information or the picture that includes the relationship between angle 1 and angle 3.

To determine the measure of angle 3, we need more information or a picture that illustrates the relationship between angle 1 and angle 3. Without additional details, it is not possible to calculate the measure of angle 3.

To determine the measure of angle 3, we need more information or a visual representation of the angles. Without the picture or more details, it is not possible to accurately calculate the measure of angle 3.