No hand written responses. I need help with a step-by-step breakdown in laymen terms for the below solution.   The shape of a colony of bacteria on a Petri dish is circular. Find the approximate increase in its area if its radius increases from 40mm to 42mm. [Recall that the area of a circle is A= pi r2squared. The estimated change in area is ____mm2squared. (Round to two decimal places as needed.)

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No hand written responses. I need help with a step-by-step breakdown in laymen terms for the below solution.
 
The shape of a colony of bacteria on a Petri dish is circular.
Find the approximate increase in its area if its radius increases from 40mm to 42mm. [Recall that the area of a circle is
A= pi r2squared.
The estimated change in area is ____mm2squared.
(Round to two decimal places as needed.)
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