plane trigonometry

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noun Mathematics.

the branch of trigonometry dealing with plane triangles.

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Origin of plane trigonometry

First recorded in 1800–10

Chérif was arrested in Paris in January 2005 as he was about to board a plane to Damascus along with a man named Thamer Bouchnak.
France Mourns—and Hunts|Nico Hines, Christopher Dickey|January 8, 2015|DAILY BEAST
As we waited for my plane to come in, we stayed silent for a long time.
The Story Behind Lee Marvin’s Liberty Valance Smile|Robert Ward|January 3, 2015|DAILY BEAST
And then I got on a plane, and guess what was playing: I Never Sang for My Father.
The Story Behind Lee Marvin’s Liberty Valance Smile|Robert Ward|January 3, 2015|DAILY BEAST
“Call me when the plane leaves the ground,” she said, in a tone that implied she knew her husband well.
Mario Cuomo, a Frustrating Hero to Democrats, Is Dead at 82|Eleanor Clift|January 2, 2015|DAILY BEAST

On Monday, Soelistyo had jolted relatives as well as searchers by suggesting that the plane could be “at the bottom of the sea.”
Wreckage, Bodies of AirAsia Crash Found|Lennox Samuels|December 30, 2014|DAILY BEAST
The sequestered spot, a seat beneath a plane tree, with a lonesome arc-lamp shining full upon it, was occupied.
The Joyous Adventures of Aristide Pujol|William J. Locke
Take a case in Trigonometry—a Complement is what remains after subtracting an angle from one right-angle.
Assimilative Memory|Marcus Dwight Larrowe (AKA Prof. A. Loisette)
Hence the latter is not level, but has, in places, steps which have been worn to an inclined plane.
The Catacombs of Rome|William Henry Withrow
Therefore the families were strong, united, sound, resisting the storm like a line of plane trees!
Frdric Mistral|Charles Alfred Downer
Then he shaved this side of the block, then the other side, with a plane, a tool with a very sharp edge.
Seven O'Clock Stories|Robert Gordon Anderson