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.

22 cm

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18 cm

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49 cm

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9 cm

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Solution

The correct option is B
18 cm

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 $\times$ 9 cm = 18 cm.

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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.

The correct option is B 18 cm 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.

The correct option is B
18 cm

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 $\times$ 9 cm = 18 cm.