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There, sure enough, was Fernando, crawling on hands and knees, his head and shoulders just appearing around the central angle.

And midway between Harry Urquhart and the half-caste guide, standing upright at the central angle, was Sheikh Bayram, the Black Dog of the Cameroons, like a great bird of prey perched above its eyrie.

This makes each base angle 72° and the vertical angle 36°, the latter being the central angle of a regular decagon,—essentially our present method.

Ephraemi this central angle is sometimes a little rounded: in Codd.

From the central angle corresponding to the arc on the surface, he calculated the radius and hence the circumference of the earth.