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To find the volume of a square pyramid, you can use the formula:
Volume = (1/3) * base area * height
In this case, the base of the square pyramid is 2.75 x 2.75 in, and the height of the pyramid is also 2.75 in.
Base area = 2.75 * 2.75 = 7.5625 in^2
Volume = (1/3) * 7.5625 * 2.75 = 6.9414 in^3
Therefore, the approximate volume of the ornament is approximately 6.93 in^3. So the answer is:
d. 6.93 in.^3