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A definite integral was first defined as the limit of sums built on rectangles. Those sums are:
ARadial sums
BRandom sums
CRiemann sums
DRamsey sums
Answer & Solution
Correct answer: C. Riemann sums
1. Rectangles approximate the area.
2. The limit gives the integral.
3. They are Riemann sums.
_Source: OpenStax Calculus Volume 2, Chapter 3, Techniques of Integration._
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