1. 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

2. EOCT Practice #1 c

3. EOCT Practice #2 c

4. EOCT Practice #3 b

5. EOCT Practice
Question of the Day

6. 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

7. 6.9
Surface Area
of Spheres

8. Radius of a Sphere r

9. 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.

10. 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.

11. Formulas for a Sphere

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

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

14. 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

15. 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

16. 6.9
Volume of Spheres

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

18. Volume of a Sphere
10 cm

19. 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

20. 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

21. 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

22. Test Prep Workbook Page 38
Class work
Test Prep Workbook Page 38

23. Homework
Page 239 #1-18