Page 71 - Mathematics Class - X

PROCEDURE

1. Place a clinometer at a suitable location.
2. Peep out through the straw to the top of the school building and note the angle (q) through which the
protractor turns from 0° to 360° line.

3. Measure the height (h) of the centre of the protractor from the ground.

4. Measure the distance (d) of the building from the point lying on the vertical line of the stand (centre of the
protractor) kept on table (Fig. (c)).
5. Repeat the above method keeping the clinometer at different positions and collect the values of q, h, d for
different settings.

Fig. (c)
6. Using the concept of trigonometric ratios, we have

H − h
tan θ=
d

where, H is the height of the building

H – h = d⋅tan q i.e., H = h + d⋅tan q

OBSERVATIONS

S. Angle measured Height of the Distance (d) of the tan q Height of
No. through protractor protractor from building from the centre the building
(angle of elevation) q ground (h) of the protractor H = h + d tan q
1. .............. .............. .............. .............. ..............
2. .............. .............. .............. .............. ..............

3. .............. .............. .............. .............. ..............

4. .............. .............. .............. .............. ..............
5. .............. .............. .............. .............. ..............
6. .............. .............. .............. .............. ..............

7. .............. .............. .............. .............. ..............

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