The groove is 1 cm wide and concentric, effectively reducing the radius of the remaining material to \( 5 - 1 = 4 \) cm. The area of the reduced circle (remaining material) is:
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- The original area of the circular microfossil is calculated using the formula for the area of a circle:
- where \( r = 5 \) cm. Thus, the original area is:
- A = \pi (5)^2 = 25\pi \text{ square centimeters.}
- A_{\text{remaining}} = \pi (4)^2 = 16\pi \text{ square centimeters.}
- Therefore, the area of the remaining microfossil material is:
- \boxed{16\pi}
