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Warm up Find the circumference of the circle with a sector area of 16 28.75

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Warm up (again) Find the area of the circle given the arc length of 16 732.5

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r Radius of a Sphere

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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.

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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.

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Surface Area of a Sphere

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8 in Surface Area of a Sphere (round to the nearest hundredths) SA = 256 π

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10 cm Surface Area of a Sphere (round to the nearest hundredths) SA = 100 π

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

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5 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. 10 in

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? in Find the radius

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? cm Find the diameter

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Volume of a Sphere

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

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10 cm Volume of a Sphere

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5 in 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. 10 in

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? cm Find the radius

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? cm Find the diameter

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