right angle

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right angle

the angle between two radii of a circle that cut off on the circumference an arc equal in length to one quarter of the circumference; an angle of 90? or π/2 radians

right angle

[′rīt ′aŋ·gəl]
(mathematics)
An angle of 90°.

right angle

An angle of 90°.
References in classic literature ?
The beak is flattened laterally, that is, in a plane at right angles to that of a spoonbill or duck.
When, however, she had crossed the stone floor of the cloister, she sat down opposite Ulysses by the fire, against the wall at right angles {180} [to that by which she had entered], while Ulysses sat near one of the bearing-posts, looking upon the ground, and waiting to see what his brave wife would say to him when she saw him.
He acquiesced in the suggestion; and we immediately, therefore, began surveying the country lying before us, with a view of determining upon the best route for us to pursue; but it presented little choice, the whole interval being broken into steep ridges, divided by dark ravines, extending in parallel lines at right angles to our direct course.
Once or twice she thought there was a stature or a gait that she recollected; but thc person who owned it instantly disappeared behind one of those enormous piles of wood that lay before most of the doors, It was only as they turned from the main street into another that intersected it at right angles, and which led directly to the place of meeting, that she recognized a face and building that she knew.
There were two other traits, moreover, by which I could always detect them; - a guarded lowness of tone in conversation, and a more than ordinary extension of the thumb in a direction at right angles with the fingers.
As Archer entered he was smiling and looking down on his hostess, who sat on a sofa placed at right angles to the chimney.
In addition to the features which I have already described, the beast was equipped with a massive tail about six feet in length, quite round where it joined the body, but tapering to a flat, thin blade toward the end, which trailed at right angles to the ground.
Through the centre runs a wide pathway intersected at right angles by other pathways so arranged as to cut the huts into square blocks, each block being the quarters of a company.
Their arms were rather longer and their legs shorter in proportion to the torso than in man, and later I noticed that their great toes protruded at right angles from their feet--because of their arboreal habits, I presume.
As suddenly as the wind rose it died again, and when it died it veered to blow at right angles to its former course in a gentle breeze.
A dozen paces straight through the underbrush, then a sharp turn at right angles for no apparent reason, only to veer again suddenly in a new direction
Here, flowing in from the east at right angles, he could see the Klondike, and, bending grandly from the south, the Yukon.