Circles Lesson 6 "Spheres"

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Note Taking Guide:
http://www.moomoomath.com/High-school-geometry-help.html#.UqfaFdJDuSo
Common Core Standard G.GMD.3

Spheres

Note taking guide
http://www.moomoomath.com/High-school-geometry-help.html#.UqfaFdJDuSo

This is a long video so use the video guide to jump to the problems you want help with.

Video Guide

0:08 Definition of a sphere

1:16 Radius of a sphere explained.

2:56 Definition of the "Great Circle"
3:27 Definition of hemisphere and a brief explanation of hemisphere

4:55 Surface area of a sphere formula

5:00 Volume of a sphere formula

5:32 Directions for finding the surface area of a sphere.

6:54 Sample Problem: . Find the surface area of a sphere with a radius of 9 in. Give both the exact answer and the rounded decimal answer.
7:52 Solution: Find the volume of a sphere with a diameter of 10cm.
10:21 Solution: Find the radius of a sphere with .volume of 72 meters cubed

13:00 The circumference of a great circle is 25 inches. Find the surface area and volume of the sphere.

17:57 Solution: A spherical balloon has a surface area of 16 in2. Find the volume of the sphere.

20:23 A spherical balloon has an initial radius of 5 in. When more air is added, the radius becomes 10 in. Explain how the surface area and volume change as the radius changes.

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