Answer:
The area of the element is approximately 19314.164 square milimeters.
Step-by-step explanation:
We proceed to calculate the area highlighted on image:
1) Calculate the area of the square:
[tex]A_{\square} = (300\,mm)^{2}[/tex]
[tex]A_{\square} = 90000\,mm^{2}[/tex]
2) Calculate the area of each circle section:
[tex]A_{sc} = \frac{\pi}{4}\cdot (150\,mm)^{2}[/tex]
[tex]A_{sc} = 17671.459\,mm^{2}[/tex]
3) Subtract the areas found in 2) from the area found in 1):
[tex]A = A_{\square}-4\cdot A_{sc}[/tex]
[tex]A = 19314.164\,mm^{2}[/tex]
