Word problem using marbles in a cylinder jar that forms a tetrahedron.

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- cos
- cos(θ) is the ratio of the adjacent side of angle θ to the hypotenuse
- cylinder
- a solid geometric figure with straight parallel sides and a circular or oval cross section.
- depth
- radius
- Distance from the center of a circle to the edge

C/2π - tetrahedron
- a polyhedron that has four faces
- tetrahedron marble problem
- triangle
- a flat geometric figure that has three sides and three angles
- volume
- quantity of 3-dimensional space