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The 20" circle (314 sq. in.) is less than half the area of the 30" circle (696.5 sq. in.) The area of the 5" wide band between the 20" dia. and the 30" dia. is 381.5 sq. in.
It's deceiving to look at it and try to guess at the areas. gotta put a slide rule to it.
The Following User Says Thank You to Dean Romig For Your Post:
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