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Individualised reading slant angle for children with special needs: A short note and a sketch note

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Individualised reading slant angle for children with special needs: A short note and a sketch note

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Individualised reading slant angle for children with special needs: A short note and a sketch note

  1. 1. Individualised reading slant angle for children with special needs: A short note and a sketch note Lalit Kishore Though the conventional trigonometry books, the examples of finding the heights of trees, buildings, mountains, etc., abound using a tan formula using either angle of elevation or depression, but, no application the classroom equipments is given. However, for reading ergonomics, the application the trigonometry tangent- formula can be used for slant boards, desks, cushions for strain-less posture and ease for the eyes. The two angles which are often used are defined thus in a any book : angle of elevation stands for the angle from the horizontal upward to an object, while angle of depression denotes the angle from the horizontal downward to an object with the observer's line of sight would be below the horizontal. For reading purposes the use of angle of depression is made since eyes read the books below on the desk, table, or board. For such a purpose, the "tan y = opposite/adjacent" is useful. Here opposite side 'h' means the height of the observer and the adjacent side 'b' is the horizontal distance between the object and the observer which for reading purposes can be taken as the the 'Least Distance of Distinct Vision' or near point which about 25 cm away from the observer (see inset sketch note). For a special educators, the following formula was devised to personalize the slant angle of reading board. Tan ɵ: Height of the eyes from bottom line / length of the fore arm of the individual

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