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Question
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.
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.
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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 × 9 cm = 18 cm.
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.
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