Elements of the Geometry of Planes and Solids: With Four Plates

ABCD angle equal angle G angles opposite angular point APPLIC base and altitude bisect centre chord circumscribed circle common intersection cone Corol cut the circumference cutting line cylinder Demonstr describe determine diagonal diameter distance draw drawn equal angles equal base equal sides equiangular equilateral triangle four right angles frustum given angle given circle given point given straight line given triangle gles greater inner angles inscribed join line BC opposite angles parallel planes parallelepiped parallelogram perpendicular plane angles Plane Geometry point of intersection prisms PROBLEM Proof proportional protracted pyramid quadrilateral figure radii radius ratio rectilineal figure regular poligon Scholium segment side AC similar similar triangles solid angles solid content sphere square subtended supposition surface tangent thence THEOREM third plane third side three lines three sides triangle ABC vertex