Explanation
Step 1
draw the shape
so, An equilateral triangle is a triangle with all three sides of equal length ,
Step 2
use the pythagorean theorem to soolve for x, then
[tex]\begin{gathered} T\mathrm{}P\text{ } \\ a^2+b^2=c^2 \\ \text{hence} \\ (\frac{x}{2})^2+20^2=x^2 \\ \frac{x^2}{4}+400^{}=x^2 \\ \frac{x^2}{4}-x^2=-400 \\ -\frac{3}{4}x^2=-400 \\ 3x^2=1600 \\ x^2=533.33 \\ x=23.09 \\ \end{gathered}[/tex]
Step 3
finally, the area of a squares is
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x
