Cross-Sections of Solids
Recall / Warm-Up
Which of the following is a two-dimensional shape?
Sphere
Cylinder
Ellipse
Cone
A rectangular prism has how many faces?
4
5
6
8
What is a cross-section of a 3D solid?
The shadow a solid casts on a wall
The 2D shape formed when a flat plane cuts through the solid
The total surface area of the solid
The outline of the solid when viewed from above
Fluency Practice
A horizontal plane cuts through a cylinder perpendicular to its axis. What is the shape of the cross-section?
Circle
Rectangle
Ellipse
Oval
A vertical plane cuts through a cylinder parallel to the cylinder's axis. What is the shape of the cross-section?
Circle
Rectangle
Ellipse
Triangle
A plane cuts through a cone perpendicular to its axis (not through the apex). What is the shape of the cross-section?
Triangle
Circle
Ellipse
Parabola
A plane cuts diagonally through a rectangular prism, entering one edge and exiting the opposite edge. What is the shape of the cross-section?
Ellipse
Circle
Rectangle
Hexagon
A plane cuts through a sphere. What is the shape of the cross-section?
It depends on the angle of the cut
Ellipse
Circle
Semicircle
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