Question

find the missing side of figure if area is 18 square​?

Answer 1

Answer:

One side of square = 18x-20

adjacent side = 42-13x

18x-20=42-13x

18x+13x=42+20

31x=62

[x=2] area of square = (18×2−20)

2

=(16)

2

=256 sq unit

Answer 2

Answer:  As one of the side of rectangle is 2 unit

Area of rectangle = length × breadth

18 = 2 × length

length = 18/2

length = 9 units .

Hope it helps you.