Q. 184.4( 280 Votes )

A spiral is made

Answer :

Circumference of 1st semicircle = πr = 0.5π


Circumference of 2nd semicircle = πr = 1π = π


Circumference of 3rd semicircle =πr = 1.5π


It is clear that a = 0.5 π, d = 0.5π and n = 13


Hence; the length of the spiral can be calculated as follows:




= (7)


=


= 143 cm

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