an olympic outdoor archery target is made up of 10 equily spaced concentric circles.concentric means that the center of each of the circles is the same.if the diameter of the biggest ring on the target is 122 cm and the diameter of the bullsye is 12.2 cenemeters, what is the diameter of the fourth ring from the inside?
+49 Would it be a SuperPuma? Or a Rhinoceratops? Or maybe even a unicorn wizard?
+33661 To put some flesh on Natthada's answer:
There are 9 gaps between the 1st (innermost) circle and the 10th circle. The distance between each circle is therefore (radius of 10th circle - radius of 1st circle)/9 = (61 - 6.1)/9 = 6.1 cm
There are 3 of these gaps between the 1st and 4th circles, hence radius of 4th circle = 6.1 + 3*6.1 = 24.4 cm, so the diameter of the 4th circle is 48.8 cm.
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