Surface Area Of A Sphere
Chapter Name : Surface Areas And Volumes |
Sub Topic Code : 104_09_13_05_01 |
Topic Name : Surface Area Of A Sphere |
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Sub Topic Name : Surface Area Of A Sphere |
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Introduction
• Surface area is the outside area that a multi-dimensional body has. • All points on the surface of sphere are equidistant from its centre. • In this section we derive Surface area of Sphere.
Pre-Requisites:
• Knowledge of squares, rectangles, and circles. • Knowledge of area and perimeter.
Activity:
You will observe 4 circles are covered with orange peels. Hence surface area of sphere is 4 times area of circle.
Real Life Question:
A company uses leather for basketball covering. Estimate how much leather is required for basketball covering?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Surface Area | Area outside multi-dimensional body. |
| Sphere | All points on surface of sphere are at equal distances from its centre. |
| Hemisphere | Half of sphere. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Oranges. | Take a large rectangular sheet and draw circles with help of orange. Draw at least 6 circles. Place orange peels on these circles. |
Real life uses :
Surface area of sphere can be applied to number of real life situations. For example, when manufacturers design a sports ball, such as soccer ball, they must make sure how much material is required for ball covering.
Places to visit :
Look for objects in your house which are spherical?
Practical examples around us
| Examples | Explainations |
|---|---|
| Surface area of earth. (earth is a sphere) | Surface area of earth is calculated to know earth’s water and land segments. |
What you learn in Theory:
Surface area of sphere is 4 times the area of circle.
What you learn in Practice:
We need to find surface area of sphere to know the outer area of the object.