The sequence defines a function 
Domain : 
Range : 
Explanation:
A sequence defines a function if it is the set of natural numbers.
Thus, the function is given by

The sequence can be determined by substituting the values for x.
For
,

For
,

For
,

For
,

For
,

Thus, from these the domain and range of a function can be determined.
The domain of a function is the set of independent values, which are generally the x-coordinates.
Domain of a function is 
The range of a function is the set of dependent values obtained by substituting the values for x.
Range of a function is 
Ok start off by finding the base first and the equation of finding the area of the square is A=bh
A=11 x 11= 121 cm^2
Next find the area of one triangle and the equation is A=1/2bh
A=1/2(11)(10)
A=55 cm^2
Multiply the area of one triangle by 4 since there are four triangles and it should equal to 220 cm^2. You then add this to the base and the final answer should be 341 cm^2.
I hope this helps
You can use the Pythagorean theorem