Classification of Prisms and Pyramids
Warm-up
Mystery shape: I have 5 faces. Two of my faces are triangles. Three are rectangles. What am I? (Triangular prism.) New: I have 5 faces. One is a square. Four are triangles. What am I? (Square pyramid.) The number and type of faces determine the shape.
Explore
Prism net construction: students construct nets for rectangular and triangular prisms, cut and fold to verify. For each: identify the base, count faces/edges/vertices, write the name. Then: find 3 prisms in the classroom or school environment.
Consolidate
Practice
Students build nets for 2 prisms, complete the quadrilateral hierarchy chart, and identify 5 prisms/pyramids in the environment with justification. Exit ticket: name a 3D shape with 6 rectangular faces.
Exit ticket
Students build nets for 2 prisms, complete the quadrilateral hierarchy chart, and identify 5 prisms/pyramids in the environment with justification. Exit ticket: name a 3D shape with 6 rectangular faces.
Faces: 2 triangles + 3 rectangles = 5. Edges: 3 on each triangle + 3 connecting them = 9. Vertices: 3+3=6. Euler check: 5+6=11=9+2. Correct.
Yes: a rectangle has two pairs of parallel sides (meeting at right angles), so it satisfies the parallelogram definition. Every rectangle is a parallelogram, but not every parallelogram is a rectangle (a rhombus that is not a square).