Case Study-1:
Due to covid-19 lockdown, Ramesh decides to redo his house garden with some plantation work with his son. They have an equilateral triangle shaped garden and he has planted the garden with 6 different types of flowers (each of radius 1 m within a circular area). This left the remaining part of garden (that is outside the circular plants area) with lush green grass.

Now, comes the part of adding boundaries to corner the garden off nicely and he needs to know some calculations for it.
A boundary wall of height 25 cm is to be made around the garden leaving a space of 1 m wide for a gate on one side. The total length of boundary wall is

Options

A. 18m
B. 20 m
C. 21 m
D. 22m