21. The result is an image that subtends about 30 degrees and appears to exist 11 feet from your eyes. 22. Each side of a regular octagon subtends half a right angle at the centre of the circle which connects its vertices. 23. It is the distance at which the mean radius of the Earth's orbit would subtend an angle of one arcsecond. 24. Monocular cues include size : distant objects subtend smaller visual angles than near objects, grain, size, and motion parallax. 25. Visual acuity = Distance at which test is made / distance at which the smallest optotype identified subtends an angle of 5 arcminutes. 26. MS-Aloha adopts a different approach and subtends the following hypotheses and rules which, basically, define all its main mechanisms. 27. Similarly the diagonals are equal to the sine of the sum of whichever "'pair "'of angles they subtend . 28. This image subtends an angular range of over 10?and required use of a shorter than usual camera length " L ". 29. It turns out that the length ( where the third side subtends an angle of ? with the second side extended ) must be: 30. For some purposes the rays of the sun can be considered as practically collimated, because the sun subtends an angle of only 322 of arc.
