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Daily Check For each circle C, find the value of x. Assume that segments that appear to be tangent are. (4 pts each) C 8 x 12 K T

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EOCT Practice #1 c

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EOCT Practice #2 c

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EOCT Practice #3 b

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EOCT Practice Question of the Day

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Math II Day 39 ( ) UNIT QUESTION: What special properties are found with the parts of a circle? Standard: MM2G1, MM2G2 Today’s Question: What effect does changing the radius have on S.A. and Volume of a sphere? Standard: MM2G4.a,b

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6.9 Surface Area of Spheres

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Radius of a Sphere r

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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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**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.

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Formulas for a Sphere

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**Surface Area of a Sphere**

(round to the nearest hundredths) 8 in

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**Surface Area of a Sphere**

(round to the nearest hundredths) 10 cm

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**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

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**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

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6.9 Volume of Spheres

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

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Volume of a Sphere 10 cm

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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

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**SA and Volume of a Sphere**

A spherical balloon has a surface area of 16 in.2 Find the volume of the sphere. 5 in 10 in

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Volume of a Sphere A sphere has an initial volume of 400 cm.3 The sphere is made bigger by making the radius 4 times as big. What is the new volume of the sphere? 5 in 10 in

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**Test Prep Workbook Page 38**

Class work Test Prep Workbook Page 38

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Homework Page 239 #1-18

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