Hello!
To solve this you need to use the equation to find the area of a circle which is
[tex]A = \pi r^{2} [/tex]
A is area
r is radius
Solve both circles
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Circle 1
[tex]A = \pi 4^{2} [/tex]
Square the number
[tex]A = 16 \pi [/tex]
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Circle 2
A = [tex] \pi 6^{2} [/tex]
Square the number
[tex]A = 36 \pi [/tex]
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Finding the answer
To get the answer you subtract the numbers
[tex]36 \pi - 16 \pi = 20 \pi [/tex]
The difference is [tex]20 \pi [/tex] which is about 62.83 units
Hope this helps!