# Definite integrals intro | Accumulation and Riemann sums | AP Calculus AB | Khan Academy | Summary and Q&A

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July 31, 2017
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Definite integrals intro | Accumulation and Riemann sums | AP Calculus AB | Khan Academy

## TL;DR

Definite integrals calculate the area under a curve between two bounds, represented by the definite integral notation.

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### Q: What is the purpose of definite integrals?

Definite integrals are used to calculate the area under a curve between two bounds, providing a way to find the exact value of the area.

### Q: How is the definite integral notation used?

The definite integral notation, represented as ∫(lower bound)(upper bound) [function] dx, indicates the area under the curve of a function between the specified bounds.

### Q: Where does the notation for definite integrals come from?

The notation for definite integrals originated from Leibniz, one of the founders of calculus. It is represented by the symbol ∫, which is known as the summa symbol.

### Q: Can definite integrals be used for finding areas with curved boundaries?

Yes, definite integrals can be used to find areas even when the boundaries are curves. This is one of the powerful applications of integral calculus.

## Summary & Key Takeaways

• Definite integrals are one of the main concepts in calculus and are closely related to indefinite integrals and derivatives.

• The area under a curve between two bounds can be calculated using the definite integral notation.

• The notation for a definite integral is ∫(lower bound)(upper bound) [function] dx.