Snyder, Virgil, 1869-1950, Sisam, Charles Herschel, b. 1879 · New York : H. Holt and Company · leaf 31
point is onthe plane if the expression vanishes. It should be observed thatthe equation must not be multiplied by — 1 after the positive andnegative sides have been chosen. 15. Angle between two planes. The anglebetween two planes is equal to the anglebetween two dii-ected normals to the planes… … Fm. 12. COS 6 = z=: (9) In particular, the condition that the planes are perpendicular isAA 4- BB + CC = 0. (10) Arts. 15, 16] DISTANCE TO A POINT FROM A PLAl The conditions that the planes ; ire parallel are (Art. 3) A B C A B C 17 (11) The equations (11) are satisfied whether the normals have…
Geometry, Analytic
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