1. Congruent and Similar Solids
Section 11.5

2. Scale Factor Order matters, simplified ratio
Congruent
Scale Factor is 1:1
Similar
Scale Factor is
1:2

3. Congruent Solids
The corresponding angles, edges, areas and volumes are all in the relationship of 1:1
Identify the
congruent solids.

5. Which cylinder is similar to Cylinder A?
Scale Factor 4 : 5
Ratio of Surface Area 16 : 25
Ratio of Volume 64 : 125

7. 1. The radii of two spheres are 3 cm and 2 cm
1.   The radii of two spheres are 3 cm and 2 cm. Find the ratio of their volumes.
27 : 8
2 : 3
3 : 2
9 : 4

8. 2. The ratio of volumes of two similar solids is 729 : 512
2. The ratio of volumes of two similar solids is 729 : 512. What is the similarity ratio (scale factor) of the solids?
81 : 64
64 : 81
9 : 8
8 : 9

9. 3. Which one of the following statements is true about the solids shown?
They are neither similar nor congruent.
Not enough information is given to judge.
They are congruent.
They are similar.