
Concept explainers
To compute area of the metal washer.

Answer to Problem 3E
Explanation of Solution
Given information:
Diameter of larger disc
Diameter of the cut out smaller disc
Formula used:
Area of circle
For calculations, value of
Calculation:
To calculate the area of the metal washer, subtract the area of the smaller cut out circular portion from the area of the large circular metallic disc.
Subtraction of the two respective areas.
On simplifying the equation.
Putting values of radii in the expression.
Expanding the square of the radii.
Multiply the result with the value of pi.
Rounding to the nearest tenth.
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