In an archery board, the radius of the yellow circle is 5cm, and the radius of each of the next circles is 2 cm more than the previous ones. Find the diameter of the blue circle.

A . 22 cm

B . 18 cm

C . 49 cm

D . 9 cm

Solution Answer: Option B :
B

Radius of the yellow circle is 5 cm.
Blue circle is the third circle from the centre of the archery board. So, its radius is 5 cm + 2 cm + 2 cm = 9 cm.
Since the diameter of a circle is twice its radius, diameter equals 2 × 9 cm = 18 cm.

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