Question:Four house are tethered at four corners of a square plot of side 63 metres so that they just can not reach one another. The area left ungrazed is : 

A `675.5 m^2` 
B `780.6 m^2` 
C `785.8 m^2` 
D `850.5 m^2` 

+ Answer
D 

+ Explanation
Required area` = (63 xx 63 - 4 xx 1/4 xx 22/7 xx 63/2 xx 63/2) m^2`

               `= 850.5 m^2`

+ Report

Irin Moni

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