.What is the volume of the open space inside the igloo pictured below
(hemisphere)?
|30 Feet|
A. 56,549 Cubic Feet
B. 14,137 Cubic Feet
C. 32,000 Cubic Feet
D. 7,069 Cubic Feet

When you carry your jewelry box or your phone 3 floors down
and 2 miles to the left, the angles and side-lengths don't change,
and it still looks exactly the same as it did before you picked it up
and moved it.

Translation can't change angles or lengths.  And if those don't
change, then the later shape is congruent to the earlier shape.