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12.7 Similar Solids HW pg. 850 #422 evens 1 April 21, 2014 Bellwork 1. If the earth has a diameter of 12,756.3 km, what is the volume of the western hemisphere? 2. If the surface area of a sphere is about 1,017.876 cm 2 , what is the radius of the sphere? 3. A beach ball has a radius of 20 inches. If the white sections were removed from the beach ball, what would the remaining volume be? (assume all sections are equal in size) 5.43 X 10 11 9=r 22,340.2 = V

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Page 1: 12.7 notes

12.7 Similar Solids

HW pg. 850 #4­22 evens 1

April 21, 2014

Bellwork 1. If the earth has a diameter of 12,756.3 km, what is the volume of the western hemisphere?

2. If the surface area of a sphere is about 1,017.876 cm 2, what is the radius of the sphere?

3. A beach ball has a radius of 20 inches.  If the white sections were removed from the beach ball, what would the remaining volume be?  (assume all sections are equal in size)

5.43 X 1011

9 = r

22,340.2 = V

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12.7 Similar Solids

HW pg. 850 #4­22 evens 2

April 21, 2014

12.7 Similar SolidsDef: 2 same type solids w/ = ratios (scale factor)

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12.7 Similar Solids

HW pg. 850 #4­22 evens 3

April 21, 2014

Similar Solids Theorem: If 2 similar solids have a  scale factor  of a:b, thencorresponding areas have ratio of a2:b2 and corresponding volumes have ratio of a3:b3.

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12.7 Similar Solids

HW pg. 850 #4­22 evens 4

April 21, 2014

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12.7 Similar Solids

HW pg. 850 #4­22 evens 5

April 21, 2014

12.7 HW pg. 850 #4­22 evens