a spiral is made up of the successive semicircles with centre ulta
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what is the question I can't understand
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Perimeter of first semi-circle =π×r=
7
22
×
2
1
=
7
11
Perimeter of second semi-circle =
7
22
×1=
7
22
So, d=
7
22
−
7
11
=
7
11
S
13
=
2
13
(2×
7
11
+
7
11
×12)
=
2
13
(
7
22+132
)=
2
13
×
7
154
=143 cm
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