Rectangular land

On a rectangular land with dimensions of 35 m and 18.5 m is a house with a square floor plan with a side of 14 m. What % of the land is not occupied?

Correct result:

p =  69.7297 %

Solution:

a=35 m b=18.5 m  c=14 m  S1=a⋅ b=35⋅ 18.5=12952=647.5 m2 S2=c2=142=196 m2  p=S1−S2S1⋅ 100=647.5−196647.5⋅ 100=258037=69.7297%

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