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10 cards from this deck
Rectangle area = length×breadth; dissection preserves area
∫\int∫ (elongated S for Sum)
Integrand
Lower and upper limits (or bounds)
12bh\frac{1}{2}bh21bh
12(a+b)h\frac{1}{2}(a+b)h21(a+b)h (average of parallel sides × width)
πr2\pi r^2πr2
Area under curve y=f(x)y=f(x)y=f(x) from x=ax=ax=a to x=bx=bx=b
f(x)δxf(x) \delta xf(x)δx (height × width)
True integral value lies between lower and upper sums
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