Final answer:
To find the grazing area for the cow tied to the pole, we use the area formula for a circle, A = πr², and with a given radius of 3.5, we get 12.25π square units as the correct answer.
Step-by-step explanation:
The question is asking for the area that a cow can graze if it is tied to a pole with a rope that is 3.5 units long. In this case, the cow can graze in a circle with radius 3.5 units around the pole. The formula to calculate the area of a circle is A = πr², where A is the area and r is the radius of the circle. Applying the given radius in the formula:
A = π(3.5)²
A = π(12.25)
A = 12.25π square units
Therefore, the correct answer is d. 12.25π square units.