Physics and Astronomy Labs/Distance and angular size

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Angular size hallway.png

Measured the width of hall to be 9 feet. The angular size was three fingers. (Perhaps 4 degrees?). Using 57 degrees for 1 radian, and adding the 9 ft hall width to our answer, we obtain:

57*9/4 + 9 =137 feet.


Compare this wih 30.36 meters using parallax.