Alarge washer has an outer radius of 10mm and a hole with a diameter of 14mm. what is the area of the top surface of the washer?

The area of the top surface of the washer is:  160.14 square mm.

The top of the surface is in the shape of a annulus  with a outer radius of 10 mm and a inner radius of 7 mm ( since the diameter of the hole is: 14 mm and we know that the radius is half of the diameter)

Now, we know that the area of the annulus region is given by:

where R is the outer radius and r is the inner radius.

Here we have:

Hence, we have:

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a

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