Why does a rainbow form an arc shape?

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Rainbows appear as circular arcs due to the refraction, dispersion, and reflection of light in water droplets. The specific angle at which light exits the droplet, typically around 42 degrees for red light, creates the characteristic arc shape. This phenomenon occurs because the light is bent and separated into its component colors as it passes through the droplet. The circular nature of the rainbow is a result of the spherical shape of the droplets and the consistent angle at which light is refracted. Understanding this optical effect clarifies why rainbows are not seen as straight lines.
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We all know as to why we see a rainbow. But why do we see it in a the form a circular arc. Why not a straight line or anything else?

I was reading one book and that gave some reason that eyes make the a particular angle at the light from the drops of water. We all know the first part that we see a rinbow only at a particular angle, but I didn't get an answer as to why it arcs??
 
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