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Radii is the plural of the word radius.If you have a circle, bisect it with a straight line - that is the diameter. Cut that in half - that is the radius. The radius is the distance from the center to the edge of the circle.A radius is one half the diameter of a circle ( the straight line distance from one point of the edge of a circle to the other side, directly in the middle). The plural form of radius is radii.
Is called a straight angle.
Given that the Beatles did not form up until well after Darwin was long dead, I would say none. Unless you refer to someone, other than Charles Darwin, who haunted the Cavern.
A straight angle is an angle.
I would claim that a straight line is slightly bend as we define straight from the horizon.