Question

what is an area of a square if length is 50 and breadth is 20

Answer 1

Its not an square , as square all sides are equal.

▶Its an rectangle ,
Area of rectangle = (length × breadth )

= 50 × 20 = 1000 unit²

Answer 2

area of square is
$length \times breadth$
$50 \times 20$
$1000 \: {unit}^{2}$
hope it helped;-)