1. 12.7 Similar Solids April 12, 2013
Bellwork 1. If the earth has a diameter of 12,756.3 km, what is the
volume of the western hemisphere?
5.43 X 10 11
2. If the surface area of a sphere is about 1,017.876 cm 2,
what is the radius of the sphere?
9 = r
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)
22,340.2 = V
Apr 12­7:33 AM
HW pg. 850 #4­22 evens 1

2. 12.7 Similar Solids April 12, 2013
12.7 Similar Solids
Def: 2 same type solids w/ = ratios (scale factor)
Apr 12­7:39 AM
HW pg. 850 #4­22 evens 2

3. 12.7 Similar Solids April 12, 2013
Similar Solids Theorem: If 2 similar solids have a scale factor of a:b, then
corresponding areas have ratio of a2:b2 and
corresponding volumes have ratio of a3:b3.
Apr 12­7:44 AM
HW pg. 850 #4­22 evens 3

4. 12.7 Similar Solids April 12, 2013
Apr 12­7:58 AM
HW pg. 850 #4­22 evens 4

5. 12.7 Similar Solids April 12, 2013
12.7 HW pg. 850 #4­22 evens
Apr 12­7:43 AM
HW pg. 850 #4­22 evens 5