This document provides information and examples about finding the volume of cylinders and cones. It includes:
1. The formula for finding the volume of a cylinder which is V = πr^2h.
2. The formula for finding the volume of a cone which is V = (1/3)πr^2h.
3. Several examples of using these formulas to calculate the volume of cylinders and cones based on given radius and height measurements.
Rational Expressions
GRADE 8 - MATHEMATICS
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Rational Expressions
GRADE 8 - MATHEMATICS
To get/buy a soft copy, please send a request to queenyedda@gmail.com
Inclusions of the file attachment:
* Fonts used
* Soft copy of the whole ppt file with effects
* Complete activities
PRICE: P200 only
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(8) Lesson 8.2
1. Course 3, Lesson 8-2
Find the volume of the cylinder. Round to the nearest tenth.
1. 2.
3. A water trough for a herd of cattle is a cylinder with a radius of 2.2
meters and a height of 1.1 meters. What is the volume of water that
can be held in the trough?
4. A cylindrical canning jar has a diameter of 3.2 inches and a height of
5.2 inches. What is the approximate volume of the canning jar?
7. Course 3, Lesson 8-2
Geometry
Words The volume V of a cone with radius r is one third the
area of the base B times the height h.
Model
Symbols V = Bh or V = πr2h
1
3
1
3
8. 1
Need Another Example?
2
3
4
Step-by-Step Example
1. Find the volume of the cone. Round to the nearest tenth.
V = πr2h Volume of a cone
V = • π • 32 • 6 r = 3, h = 6
V ≈ 56.5 Simplify
The volume is about 56.5 cubic inches.
10. 1
Need Another Example?
2
3
4
Step-by-Step Example
2. A cone-shaped paper cup is filled with water. The height of the cup
is 10 centimeters and the diameter is 8 centimeters. What is the
volume of the paper cup? Round to the nearest tenth.
V = πr2h Volume of a cone
r = 4, h = 10
V ≈ 167.6 Simplify
The volume of the paper cup is about 167.6 cubic centimeters.
V = • π • 42 • 10
11. Answer
Need Another Example?
A cone-shaped vase has a height of 15 centimeters
and a diameter of 8 centimeters. What is the volume
of the vase? Round to the nearest tenth.
251.3 cm3
12. 1
Need Another Example?
2
3
Step-by-Step Example
3. Find the volume of the solid.
Round to the nearest tenth.
Find the volume of the cylinder.
Volume of a cylinder
So, the volume of the solid is about 201.1 + 83.8 or
284.9 cubic feet.
Find the volume of the cone.
Volume of a cone
V = π • 42 • 4
V = π • 16 • 4
V ≈ 201.1
V = πr2h
r = 4, h = 4
Simplify
Simplify
V = πr2h
V = π • 42 • 5
V = π • 16 • 5
V ≈ 83.8
r = 4, h = 5
Simplify
Simplify
14. How did what you learned
today help you answer the
WHY are formulas important
in math and science?
Course 3, Lesson 8-2
Geometry
15. How did what you learned
today help you answer the
WHY are formulas important
in math and science?
Course 3, Lesson 8-2
Geometry
Sample answers:
• The formula is used to find the volume of a
cone.
• When having a cylinder and a cone as a composite
solid, the formulas and can be used to
find the volume of the composite figure.
V r h 21
3
2V r h V r h 21
3
16. How did the previous lesson
on finding the volume of
a cylinder help you with
finding the volume of a cone?
Course 3, Lesson 8-2
Ratios and Proportional RelationshipsFunctionsGeometry