1. Volume By Slicing
AP Calculus

2. Volume
Volume = the sum of the quantities in each layer

3. x x x x y
x-axis

4. Volume by Cross Sections

5. BE7250
Axial (cross sectional) magnetic resonance image of a brain with a large region of acute infarction, formation of dying or dead tissue, with bleeding. This infarct involves the middle and posterior cerebral artery territories.
Credit: Neil Borden / Photo Researchers, Inc.

6. Volume by Slicing
(Finding the volume of a solid built on the base in the x – y plane) METHOD:
1.) Graph the “BASE”
 2.) Sketch the line segment across the base.
That is the representative slice “n”
Use “n” to find: a.) x or  y (Perpendicular to axis)
b.) the length of “n”
 3.) Sketch the “Cross Sectional Region” - the shape of the slice (in 3-D )
from Geometry V = B*h h = or is the thickness of the slice
B = the Area of the cross section
 4.) Find the area of the region
 5) Write a Riemann’s Sum for the total Volume of all the Regions

7. Example 1: Base Cross -Section
The base of a solid is the region in the x-y plane bounded by the graph
and the y – axis. Find the volume of the solid if every cross section by a plane perpendicular to the x-axis is a square.
Example 1:
Base
Cross -Section

8. The base of a solid is the region in the x-y plane bounded by the graph
and the y – axis. Find the volume of the solid if every cross section by a plane perpendicular to the x-axis is an Isosceles Rt. Triangle (leg on the base).
Example 2:

9. Some Important Area Formulas
Square-
side on base
Square-
diagonal on base
Equilateral Δ
Isosceles rt Δ
leg on base
Isosceles rt Δ
hypotenuse on base

10. EXAMPLE #4/406
The solid lies between planes perpendicular to the x - axis at x = -1 and x = 1 . The cross sections perpendicular to the x – axis are circular disks whose diameters run from the parabola y = x2
to the parabola y = 2 – x2.

11. Volumes of Revolution: Disk and Washer Method
AP Calculus

12. Volume of Revolution: Method
Lengths of Segments:
In revolving solids about a line, the lengths of several segments are needed for the radii of disks, washers, and for the heights of cylinders.
A). DISKS AND WASHERS
1) Shade the region in the first quadrant (to be rotated)
2) Indicate the line the region is to be revolved about.
3) Sketch the solid when the region is rotated about the indicated line.
4) Draw the representative radii, its disk or washer and give their lengths.
<<REM: Length must be positive! Top – Bottom or Right – Left >>
Ro = outer radius
ri = inner radius

13. Disk Method The Formula: The formula is based on the
Rotate the region bounded by f(x) = 4 – x2 in the first quadrant about the y - axis
The region is _______________ _______ the axis of rotation.
The Formula: The formula is based on the
_____________________________________________

14. Washer Method The Formula: The formula is based on
Rotate the region bounded by f(x) = x2, x = 2 , and y = 0 about the y - axis
The region is _______________ __________ the axis of rotation.
The Formula: The formula is based on
_____________________________________________

15. Disk Method
Rotate the region bounded by f(x) = 2x – 2 , x = 4 , and y = 0 about the line x = 4
The region is _______________ _______ the axis of rotation.

16. Washer Method
Rotate the region bounded by f(x) = -2x , x = 2 , and y = 0 about the y - axis
The region is _______________ __________ the axis of rotation.

17. Example 1: The region is bounded by Rotated about:
the x-axis, and the y-axis a) The x-axis
b) The y-axis
c) x = 3
d) y = 4

18. Example 2: The region is bounded by: Rotated about:
f(x) = x and g(x) = x2 a) the x-axis
in the first quadrant b) the y-axis
c) x = 2
d) y = 2

19. The base of a solid is the region in the x-y plane bounded by the graph
and the x – axis. Find the volume of the solid if every cross section by
a plane perpendicular to the x-axis is an Isosceles Rt. Triangle (leg on the base).
Example 2: