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Warm up!Find the surface area of the backpack to
the nearest inch:
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bhAThe base is 12 in, but what is the height? (Hint: what is the radius of the circle?)
1112A132A
The back has the same area:
264backfrontA
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bhA
114A
44AThe left side has the same area:
88rightleftA
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bhA
124A
48A
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2
2
1rA
262
1A
55.56AThe back has the same area:
1.113backfrontA
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rhA 22
1
rhA 46A
4.75A
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4.75A
264backfrontA
88rightleftA48A
1.113backfrontA
2in589A
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Spheres
Geometry
Unit 6, Day 6
Mr. Zampetti
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What is a Sphere?
Definition:
A 3-dimensional circle.
Examples:
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Formulas
Surface Area Volume
24 rSA 3
3
4rV
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Example #1
Calculate the volume of:
15”V = 4/3 r3
V = 4/3(15)3
V 14130in3
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Example #2
Calculate the volume of:
V = 4/3 r3
V = 4/3(3.9)3
V 248.349in3
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Example #3
Calculate the surface area of:
S = 4r2
S =4(6.1)2
S 467.3576 in2
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Homework
Work Packet:
Spheres