In an archery board, the radius of the yellow circle is 5cm, and each of the nex

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In An Archery Board, The Radius Of The Yellow Circle Is 5cm,...

In an archery board, the radius of the yellow circle is 5cm, and each of the next circle is 2cm more in radius than its previous one. Find the diameter of the black circle.

Options:

A . 18cm

B . 22cm

C . 49cm

D . 9cm

Answer: Option B
:
B
Radius of the yellow circle is 5cm
Black circle is the 4th circle from the center. So, its radius is 5 + 2 + 2 + 2 = 11cm
Radius = 11cm. Therefore, diameter is

2 \times 11 c m

= 22cm

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