Answer:
3.5 
Step-by-step explanation:
For a shape that is half a circle, use the formula: A =
π 
Calculate the radius, which is half of the diameter: r = d/2 = 3/2 = 1.5
Insert r = 1.5 into the formula.
A =
π 
A =
(3.14) 
Calculate the result with your calculator and round it off.
The final answer is 3.5