This question is for elementary grade student:

1. What shape has 12 edges all the same length?
   
   
2. What shape has 3 surfaces and 1 is curved?

For the first question think the teacher is looking for a cube. It has 12 edges of the same length, and 6 faces.

For the second question I can think of many shapes that fit this description.

Take a solid sphere and cut it in half through the centre to form a hemisphere. Put the hemisphere on the table with the flat side down and cut it again by a plane, parallel to the table top. You are left with a shape that meets your requirements. It looks like a cereal bowl, upside down.

Another shape that meets your requirements is a sector of an orange.