Circle and rectangle

A rectangle with sides of 11.7 cm and 175 mm is described by circle. What is its length? Calculate the content area of the circle described by this circle.

Correct result:

x =  66.1333 cm
S =  348.0413 cm2

Solution:

a=11.7 cm b=175/10=352=17.5 cm u=a2+b2=11.72+17.52≐21.0509 cm r=u/2=21.0509/2≐10.5254 cm x=2π⋅ r=2⋅ 3.1416⋅ 10.5254=66.1333 cm
S=π⋅ r2=3.1416⋅ 10.52542=348.0413 cm2

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