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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