Question

the area of rectangle is 20 CM square if the breadth is 4 cm then find out the length of the rectangle

Answer 1

Length of rectangle=area÷breadth

breadth = 4cm

area = 20cm sq.

Length =20÷4

=5cm

Answer 2

$ar(rectangle) = l \times b \\ 20 = l \times 5 \\ \frac{20}{5} = l \\ l = 4cm$