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.

18cm

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22cm

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49cm

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9cm

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Solution

The correct option is B
22cm

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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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.

The correct option is B 22cm 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 2×11cm = 22cm

The correct option is B
22cm

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