Question

A rectangular field is 30 m by 40 m. What distance
is saved by walking diagonally across the field ?
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Answer 1

Answer:

When the person walks using the length and breadth of the rectangle he covers 30+40 = 70 m, but when he walks using the diagonal of the rectangle he covers 50 m only. So, he saves 70-50 = 20 m by walking diagonally across it. Hence, the person saves 20 meters by walking diagonally across

Answer 2

Answer:

To find the length of the diagonal you can use the pythagorean theorem: a^2+b^2=c^2 

So: 

30^2+40^2=c^2 

900+1600=c^2 

2500=c^2 

50 = c, the length of the diagonal walk 

It 50m to walk diagonally, and 70 to walk width by length. so you save 20 feet.