Using Euler’s formula, find the value of $x$.

Faces	Vertices	Edges
$x$	$15$	$20$

 

Using Euler’s formula, find the value of $y$.

Using Euler’s formula, find the value of $z$.

What is the least number of planes that can enclose a solid? What is the name of the solid?

Is a square prism same as a cube?

Dice are cubes where the sum of the numbers on the opposite faces is $7$. Find the missing numbers $\mathrm{a}, \mathrm{b} \text{and} \mathrm{c}.$

Name the polyhedron that can be made by folding the following net.

Name the polyhedron that can be made by folding the following net.