You have to program several functions. In each case, few lines of code are enough.

- Write a function
*drawH(n)*that given an odd integer*n*≥ 3 prints a letter`H`of size*n*formed with symbol`*`. Follow the pattern of the example below. - Write a function
*area_circle(r)*that given a float number*r*≥ 0 returns, rounded to the hundredth, the area of the circle of radius*r*. Use the`pi`constant defined in the math module. - Write a function
*slow_pi_aprox(n)*that given a non negative integer*n*computes 4∑_{k = 0}^{n}(−1)^{k}/2*k*+ 1 rounded to the hundredth. - Write a function
*is_univariate_number(n)*that given a non negative integer returns a boolean pointing out whether*n*is represented using only one digit. For instance 22222 is univariate but 22322 is not. - Write a boolean function
*is_univariate_word(s)*that given an string*s*returns`True`if and only if*s*is formed using only one letter. For instance word`xxXxXXx`is univariate but`xxXxy`is not. We assume*s*is non empty and all characters of*s*are letters.

**Scoring**

Every function counts 20 points.

Sample session

>>> drawH(5) * * * * ***** * * * * >>> area_circle(2.5) 19.63 >>> slow_pi_aprox(50) 3.16 >>> is_univariate_number(22322) False >>> is_univariate_word("xxXxXXx") True