INTRODUCTION TRIGONOMETR Y TO 8 - NCERT

INTRODUCTION TO TRIGONOMETRY1738 There is perhaps nothing which so occupies themiddle position of mathematics as trigonometry. Herbart (1890) have already studied about triangles, and in particular, right triangles, in yourearlier classes. Let us take some examples from our surroundings where right trianglescan be imagined to be formed. For instance the students of a school arevisiting Qutub Minar. Now, if a studentis looking at the top of the Minar, a righttriangle can be imagined to be made,as shown in Fig Can the studentfind out the height of the Minar, withoutactually measuring it? 2. Suppose a girl is sitting on the balconyof her house located on the bank of ariver. She is looking down at a flowerpot placed on a stair of a temple situatednearby on the other bank of the right triangle is imagined to be madein this situation as shown in Ifyou know the height at which theperson is sitting, can you find the widthof the river?

8.1 Introduction You have already studied about triangles, and in particular, right triangles, in your ... astronomers used it to find out the distances of the stars and planets from the Earth. Even today, most of the technologically advanced methods used in Engineering and

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