The radius of a regular decagon, a 10-sided figure, is 15 units. The length of one side of the polygon measures about 9.3 units. What is the approximate area of the regular decagon rounded to the nearest tenth?

The formula for solving the area of a regular decagon is shown below:

A = (5/2) a²√ (5+2√5)

where "a" refers to the measurement of the side on which in this problem, it is equal to 9.3 units

We can proceed in solving for the area and the solution is shown below:

A = (5/2) * (9.3) ²√ (5+2√5)

A=665.47 square units

The answer is 665.47 square units.