If the semi major and semi minor axis of a galaxy are 3" and 1" respectively, how would you find the radius of the galaxy?

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    $\begingroup$ What do you mean by "radius ... given its inclination"? The semi-major and semi-minor axes are the radii of an ellipse. $\endgroup$ – Mick Aug 27 '18 at 7:19
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    $\begingroup$ When you update, please be sure to clarify units. ' 3" ' could be inches , or seconds of arc, among others. $\endgroup$ – Carl Witthoft Aug 27 '18 at 18:24

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