Question

a rectangle has an area of 21 square cm if the width is 3 cm whats the length

Answer 1

$\huge \purple{\tt{Answer:}}$

Breadth = 3 cm

Area = 21 cm²

$\sf { Length = {\dfrac {Area}{Breadth}}} \\\\\ \sf = {{\dfrac{21}{3}}} \\\\\ \sf = 7~cm$

Answer 2

Answer: 7 cm

given that,

area of the rectangle = 21 cm^2 = length x breadth

width(breadth) of the rectangle = 3 cm

now, length x breadth = 21

length x 3 = 21

length = 21/3 = 7cm

therefore, length of the rectangle = 7cm