A "solid feature" or major topic in Leithold's integral calculus section involves using definite integrals to find the volume of a 3D object created by rotating a 2D region around an axis. Leithold breaks this down into three primary methods: Disk Method:
: Using cylindrical and spherical coordinates for complex regions. leithold.pdf el calculo integral de leithold pdf
You can find the full textbook and specific chapters on these platforms: A "solid feature" or major topic in Leithold's