Q2 of 805 Page 14

With the same centre O, draw two circles of radii 4 cm and 2.5 cm.

Using a scale draw line segments OB=4cm and OA=2.5cm



Step 2: With O as a centre and A and B as radius draw two circles using a compass



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26

A man in a boat rowing away from a light house 100 m high takes 2 minutes to change the angle of elevation of the top of the light house from 60⁰ to 30⁰. Find the speed of the boat in metres per minute. [Use ]


Or


Two poles of equal heights are standing opposite to each other on either side of the road, which is 80 m wide. From a point between them on the road, the angle of elevation of top of the poles are 60⁰ and 30⁰ respectively. Find the height of the poles and the distances of the point from the poles.


 1

Draw a circle of radius of 3.2 cm.

 3

Draw a circle and any two of its diameters. If you join the ends of these diameters, what is the figure obtaines?

What figure is obtained, if the diameters are perpendicular to each other? How do you check your answer?


 4

Draw any circle and mark points A, B and C such that

(a) A is on the circle.


(b) B is in the interior of the circle.


(c) C is in the exterior of the circle.