What's known:

A rectangular swimming pool with,

length = 20 m

breadth = 17 m

And it's surrounded by a walkway with,

breadth = 1.5 m

The question:

The area of the walkway.

Answer:

The Area of the swimming pool without the walkway or A1 for short.

length = 20 m

breadth = 17 m

Area = length × breadth

A = 20 × 17

A = 340 m² (A1)

The Area of the swimming pool including the walkway or A2 for short. (+1.5 m)

length = 21.5 m

breadth = 18.5 m

Area = length × breadth

A = 21.5 × 18.5

A = 397.75 m² (A2)



Area of the walkway,

A2 - A1

397.75 - 340

57.75 m²

So the Area of the walkway is 57.75 m²