Did you make a sketch?
An equilateral triangle and a circle have the same center.
The area of the triangle not in the circle equals the area of the circle not in the triangle.
If the radius of the circle is 1, find the length of the side of the traingle (nearest hundredth).
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"The area of the triangle not in the circle" is the sum of the three "triangular" regions.
"The area of the circle not in the triangle" is the sum of the three segments.
These two areas can be expressed, using the inscribed regular hexagon
. . (which I did not try to draw) and a variety of area formulas.
Too slow again . . . Great diagram, Earboth!