Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 156
BOOK 155 Of the Sphere … Then, since CO is perdendic-ular to the plane AMB, the an-gles COA, COM &c, will beright angles, and since the radiiof the sphere are all equal, theright angled triangles CAO, COM,&c, will have the hypothenusesequal, and the side CO common :hence, the remaining sides will be equal (Bk. I.…
Geometry · Plane trigonometry
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