SPHERES Surface Area and Volume Geometry Regular Program SY Sources: Discovering Geometry (2008) by Michael Serra Geometry (2007) by Ron Larson
The Geometric Solids
SPHERE
HEMISPHERE: Half a sphere PLUS the circular base The circle that encloses the base is the GREAT CIRCLE. If you were to slice a pingpong ball, where do you slice it to get the largest circular cross-section? If a plane cuts a sphere along the center, then the plane contains the great circle. Is the equator In a globe a great circle?
How do we obtain the Volume of a sphere? Video 1
How do we obtain the Volume of a sphere? Video 2
Volume of a Sphere Volume of a sphere with radius r
Example:
How do we obtain the Surface Area of a sphere? Video 3
How do we obtain the Surface Area of a sphere? Video 4
How do we obtain the Surface Area of a sphere?
Surface Area of a Sphere Surface Area of a sphere with radius r How many circle areas cover the sphere?
Example:
Sphere Surface Area Volume Given a sphere with radius r
Solve for the VOLUME and Surface Area:
Solve for the unknown and Surface Area:
Solve for the unknown: