The shape of the triangle is the cross-section part of the given figure. Thus, option A is correct.
How to find the shape inscribed in a square?
The cross-section part of the given figure could be the shape fro the inscribed figure.
Here we can see that the three-dimensional figure inscribed in the square is a cone.
The right circular cone is the cone in which the line joining peak of the cone to the center of the base of the circle is perpendicular to the surface of its base.
But for the plane of the square, the triangle is the cross-section part of the given figure.
Learn more about shape here;
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