For the circle we can just do 7.5^2*3.14=176.625 because if you put the 2 semi circle you get a whole circle.
and if the diameter is 15 then the width of the rectangle is 15 so 28*15=420+176.625=596.625
Answer:
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1. C irrational
2. B Rational, integer
3. D 3.14...
6.4x10^5 + 0.36x10^5 = 6.76x10^5, or 676,000