What is the shape of the cross section in the figure?

Circle
Rectangle
Square
Triangle

The radius of the base of a cylinder is 10 centimeters, and its height is 20 centimeters. a cone is used to fill the cylinder with water. the radius of the cone's base is 5 centimeters, and its height is 10 centimeters.

4+(2+x) can you me solve this problem

Select the conic section that represents the equation. 3x2 + 3y2 -2x + 4 = 0