Find the area of the circular path for given inner & outer radius

Matching exercise

    
Match the items on the right to the items on the left.
outer radius is 32 cm and inner radius is 18 cm.
outer radius is 10 cm and inner radius is 3 cm.
outer radius is 30 cm and inner radius is 20 cm.
outer radius is 32 cm and inner radius is 19 cm.
Area = 2199
Area = 286
Area = 1570
Area = 2082