6.9 Surface Area of Spheres.

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Presentation transcript:

6.9 Surface Area of Spheres

Radius of a Sphere r

If you cut a sphere right down the middle you would create two congruent halves called HEMISPHERES. You can think of the globe. The equator cuts the earth into the northern and southern hemisphere.

A circle!!! This is called the GREAT CIRCLE of the sphere. Look at the cross section formed when you cut a sphere in half. What shape is it? A circle!!! This is called the GREAT CIRCLE of the sphere.

Surface Area of a Sphere

Surface Area of a Sphere (round to the nearest hundredths) 8 in

Surface Area of a Sphere (round to the nearest hundredths) 10 cm

The circumference of a great circle of a sphere is 25 inches The circumference of a great circle of a sphere is 25 inches. Find the surface area of the sphere. (Round to the nearest tenths.) 25 in

Surface Area of a Sphere A spherical balloon has an initial radius of 5 in. When more air is added, the radius becomes 10 in. Explain how the S.A. changes as the radius changes. 5 in 10 in

Find the radius ? in

Find the diameter ? cm

Volume of Spheres

Volume of a Sphere

Volume of a Sphere (round to the nearest hundredths) 2 cm

Volume of a Sphere 10 cm

Volume of a Sphere A spherical balloon has an initial radius of 5 in. When more air is added, the radius becomes 10 in. Explain how the volume changes as the radius changes. 5 in 10 in

Find the radius ? cm

Find the diameter ? cm