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Notes for some applications to trigonometry chapter of class 10 Mathematics. Dronstudy provides free comprehensive chapterwise class 10 Mathematics notes with proper images & diagram.

**(1) The line drawn from the eye of an observer to a point in the object where the person is viewing is called the line of sight.**In above figure point is a eye of observer and point is a object so line of joining both point is a line of sight.

**(2) The angle formed by the line of sight with the horizontal when the object is above the horizontal level is called the angle of elevation.
**In above figure Â is the angle of elevation.

**(3) The angle formed by the line of sight with the horizontal when the object is below the horizontal level is called the angle of depression.
**In above figure is the angle of depression.

**(4) The height of an object or the distance between distant objects can be determined with the help of trigonometric ratios.**

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