Decagon 5145

Find the area of a regular decagon if its side is 10 cm in size.

Correct answer:

S =  769.4209 cm2

Step-by-step explanation:

n=10 s=10 cm p=s n=10 10=100 cm A=180/n=180/100.3142 rad a=s/(2 tan(A))=10/(2 tan0.3142)15.3884 S=a p/2=15.3884 100/2=769.4209 cm2



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