Question 11 Mark
Out of the following four nets there are two correct nets to make a tetrahedron. Identify them. 
Answer
View full question & answer→For making a tetrahedron, only $(i)$ and $(iii)$ are suitable nets.
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Question 21 Mark
Identify the nets which can be used to make cubes (cut-out the nets and try it): 
Answer
View full question & answer→Only $(ii), (iv)$ and $(vi)$ form a cube.
