workbook pg. 231 #1-22 (skip 15 &19). monday october 8 daily check: chords
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Workbook pg. 231
#1-22 (skip 15 &19)
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Monday October 8
Daily Check:Chords
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Daily Check1. 2.
3. 4.
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D
Describe the extrema of the quadratic y = -2(x – 3)2 + 2
a. Maximum at (-3, 2)
b. Minimum at (-3, 2)
c. Minimum at (3, 2)
d. Maximum at (3, 2)
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r
HEMISPHERE: HALF A SPHERE
Think of the globe!
The equator cuts the earth into the northern and southern hemisphere.
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Formulas for a Sphere2
3
4
4
32
SA r
V r
C r
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10 cm
Find the exact and approximate Surface Area & Volume of a Sphere (round to the nearest hundredths)
216.314100 cmSA 3500
523.60 cm3
V
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25 in
The circumference of a great circle of a sphere is 25 inches. Find the approximate surface area & volume of the sphere. (Round to the nearest tenths.)
3.979r 2198.96SA in
3263.88 inV
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5 in
SA and Volume of a SphereA spherical balloon has a surface area of 16 in.2 Find the volume of the sphere.
36.02 inV
10 in
34
3V rSA4 r2
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5 in
Surface Area & Volume of a SphereA spherical balloon has an initial radius of 5 in. When more air is added, the radius becomes 10 in. Explain how S.A. and Volume change as the radius changes.
10 in
is 8 times biggerV is 4 times biggerSA
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Old Sphere New Sphere
Radius
Surface Area
Volume
If radius is doubled…
x 2
x 22
x 23
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Old Sphere New Sphere
Radius
Surface Area
Volume
If radius is 5 times bigger…
x 5
x 52
x 53
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Old Sphere New Sphere
Radius
Surface Area
Volume
If radius is 2/3 smaller…
x 2/3
x (2/3)2
x (2/3)3
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5 in
Volume of a SphereA 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?
325,600 inV
10 in
34
3V r
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