youcubed: The Volume of a Lemon
youcubed (Stanford University)

This task is designed to introduce students to the ideas of calculus – in particular, finding the volume of a complex shape (a lemon).

Khan Academy: AP®︎/College Calculus AB
Khan Academy

Learn AP®︎ Calculus AB for free—everything you need to know about limits, derivatives, and integrals to pass the AP® test.