Round table

A tablecloth should be sewn on a round table with a diameter of 78 cm, which should extend around the table by 10 cm. How many cms of ribbons need to be bought for edging?

Correct result:

x =  307.9 cm


D=78 cm a=10 cm  r=D/2=78/2=39 cm r2=r+a=39+10=49 cm  x=2π r2=2 3.1416 49=307.9 cm

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