What this lesson shows
Prisms, pyramids, cylinders, cones, and spheres by their faces, bases, and apex.
The worked example
The lesson works this one step by step: a rectangular prism, a square pyramid, a cylinder, a cone, a sphere. Then your kid tries one like it on paper.
The steps
- Count the bases
- Flat faces or a curved surface?
- Look for an apex
Helping at home
Count the bases first. 2 matching bases: a prism (flat faces) or a cylinder (curved surface). 1 base and an apex: a pyramid (triangle faces) or a cone (curved surface). No base: a sphere. The shape of the base names a prism or pyramid.
If your kid gets stuck
Count the bases. Look for an apex.
Watch it with Lux
With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.
More in this unit
- Triangles two ways
- Every name that fits
- Not only the last name
- Turning does not change it
- Volume by packing cubes
- No gaps, no overlaps
- Volume by formula
- The base is an area
- Find the missing edge
- Two boxes put together
- Nets of solids
- Area of parallelograms and triangles
- The angles of a triangle
- Area of a trapezoid
- Estimating around a curve
- Radius and diameter
- Perimeter, area, or volume?
- Surface area with a net