Answer is A = 2091.63 cm
Step by step
We know the formula for area of a circle
A = pi x radius ^2
We want a semi circle which is half a circle, so 1/2 of Area
Semi circle Area = 1/2 x pi x radius ^2
We know diameter is 73, so half of diameter is the radius = 36.5
A = 1/2 x 3.14 x 36.5^2
A = 1/2 x 3.14 x 1332.25
A = 2091.6325 cm
Round to 2 decimal points
A = 2091.63 cm