Volume Of A Sphere
Chapter Name : Surface Areas And Volumes |
Sub Topic Code : 104_09_13_09_01 |
Topic Name : Volume Of A Sphere |
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Sub Topic Name : Volume Of A Sphere |
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Introduction
• The volume of sphere is the amount of space enclosed by it. • The volume is measured in cubic units. • Examples of sphere are marbles, soccer ball, basketballs.
Pre-Requisites:
• Knowledge of squares, rectangles, and circles. • Knowledge of area and perimeter.
Activity:
You will observe the value of (4÷3)?r³ is equal to the measure of water shown in measuring jar.
Real Life Question:
How large the tennis balls need to be to meet the specifications of the sport?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Volume | Space occupied by an object. |
| Cubic units | Units for measuring volume. Volume is measured in three dimensions so the units of volume are cubic. |
| Hemisphere | Half of sphere. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Spherical ball, container, trough, measuring jar, water | Take a container and place it on trough. Fill the container fully with water. Place ball in the container. Measure the water overflowed in trough by measuring jar. Evaluate value (4÷3)?r³. |
Real life uses :
A pharmaceutical company making round pills need to know the dosage of medicine, for this they need to know volume of the pill.
Places to visit :
Look for objects in your house which are spherical?
Practical examples around us
| Examples | Explainations |
|---|---|
| How much does earth weigh? | Astronomer who wants to calculate how much earth weighs need to calculate its volume. |
What you learn in Theory:
Volume of sphere is equal to (4÷3)? times the cube of its radius.
What you learn in Practice:
Volume of sphere can be applied to many real life situations. For example when a sports ball manufacturing company designs a ball they must make sure that ball meets certain specifications. To do this, they determine how large the ball should be and they use volume of sphere formula.