Silver medal

To circular silver medal with a diameter of 10 cm is inscribed gold cross, which consists of five equal squares. What is the content area of silver part?

Correct result:

S =  50 cm2


D=10 cm D2=a2+(3a)2 D2=a2+9a2 D2=10 a2  D=10a a=D/10=10/10=10 cm3.1623 cm n=5  S=n a2=5 3.16232=50 cm2

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