Cartesian Product of Interval

Question

I know what is a cartesian product of sets, for example, $M= \{1,2\} , N = \{a,b\} $

$M \times N = {(1,a), (1,b), (2,a) , (2,b)}$

but what is the Cartesian product of two intervals? say,

$[-5,1] \times [-2,3]$

Answer 1

By definition it is the set of couple: $$ \{(x,y)|x\in[-5,1]\land y\in[-2,3] \} $$ so it the rectangle $EFGH$ in the figure.