Area of yellow region

Dear student,

Area of bigger circle =πR2=227×4×4=50.28 cm2Now the radius of smaller circle=4-1=3 cmArea of smaller circle =πr2=227×3×3=28.28 cm2Area of yellow circle=Area of bigger circle -Area of smaller circle =50.28 cm2-28.28 cm2=22 cm2

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