Wentworth's Plane Geometry

angle arc BC arcs CD breadth or thickness called a surface circles intersect circles is called comes nearer common chord common external tangent common internal tangent Common Tangents CQ are parallel cut the line-segment diameter BD diameter perpen dicular difference dimensions Draw OA drawn through four example EXERCISE 29 external tangent figure CF four points geometric line geometric solid grees hence hexagon here shown internal tangent joining the centers length limited portion line of centers line-segment equal line-segment greater line-segment joining line-segment less mid-point nearer and nearer nearer to representing opposite sides parallel tangents meeting perpendicular bisector physical solid plane portion of space PROPOSITION Prove that AB+CD+EF Prove that AP quadrilateral radii reasoning Show side tangent sides is equal simply the boundary solid shown space is called straight angle straight edge straight line sum but greater THEOREM 195 thickness is called width