[188] Newton. Princ. Lib. I. prop. 66. coroll. 7.
[189] Menelai Sphaeric. Lib. I. prop. 10.
[190] Vid. Newt. Princ. Lib. I. prop. 66. coroll. 10.
[191] Vid. Newt. Princ. Lib. III prop. 30. p. 440.
[192] Ibid. Lib. I. prop. 66. coroll. 10.
[193] What this proportion is, may be known from Coroll. 2 prop. 44. Lib. I. Princ. philos. Newton.
[194] Princ. Phil. Newt. Lib. I. prop. 45. Coroll. 1.
[195] Pr. Phil. Newt. Lib. I. prop. 66. Coroll. 7.
[196] See § 19 of this chapter.
[197] Phil. Nat. Pr. Math Lib. I. prop. 66. cor. 8.