What's a polygon with four unequal sides called?

what's a flat image that can be displayed in three dimensions?

what number does "giga" stand for?

how many equal sides does an icosahedron have?

what do mathematicians call a regular polygon with eight sides?

plz

A polygon with four unequal sides is called a quadrilateral.
A flat image that can be displayed in three dimension is called a hologram. 
Giga stands for 10 to the 9th power.
A Icosahedron has 20 equal sides.
Mathematicians call a regular polygon with eight sides, an Octagon. 

Hope this helps ^-^

First one: A quadrilateral.

Second one: A hologram

Third one: One billion.

Fourth: Twenty.

Fifth one: An octagon

Hope this helpes :)