Geometría interactiva y funciones · 3D Spatial Geometry (Surface Area & Volume), 3D Shapes & Nets, AMC 8 Spatial Reasoning.
Visualizador de cubos pintados y desarrollo poliédrico
Visualizador de cubos pintados de n×n×n y desarrollo plano: conteo de caras coloreadas
- Cálculo en cliente
- Sin registro
- Derivación en vivo
- Modo proyector
- Hoja de trabajo A4
Ventana de demostración geométrica● 60 FPS
Variables de control del experimento
modo
órdenes
mm
#
%
Derivaciones y métricas en tiempo real
Pintados 3 caras (vértices)
--
Always exactly 8 corners
Pintados 2 caras (aristas)
--
12 edges × (n-2)
Pintados 1 cara (centro de cara)
--
6 faces × (n-2)²
Pintados 0 caras (núcleo)
--
Unpainted inner core (n-2)³
Derivación de fórmulas en tiempo real
Fórmula básica:
--Sustitución de valores:
--Conclusión: --
Versión para primaria:🎮 Desarrollo, área y volumen del ortoedro ↗
Ejemplos clásicos y análisis de errores en exámenes
5x5x5 Cube Complete Color Block Classification
Problema: A 5×5×5 cube painted red on all sides is sliced into 125 small 1×1×1 unit cubes. How many unit cubes have exactly 2 red faces and exactly 1 red face?
Estrategia analítica: 2-face painted blocks sit on the 12 edges excluding corners: 12 × (5-2) = 36. 1-face painted blocks sit inside the 6 outer faces: 6 × (5-2)² = 54.
Derivación paso a paso:
- Step 1: Total unit cubes N = 5³ = 125, division parameter n = 5.
- Step 2: 3-face cubes located at 8 vertices: constant 8.
- Step 3: 2-face cubes on 12 edges: 12 × (5 - 2) = 36.
- Step 4: 1-face cubes in 6 face centers: 6 × (5 - 2)² = 6 × 9 = 54.
- Step 5: 0-face unpainted core cubes: (5 - 2)³ = 27.
- Step 6: Verification check: 8 + 36 + 54 + 27 = 125.
⚠️ Error conceptual frecuente: Double-counting corner cubes on the edges; corners strictly belong to the 3-face painted category, so subtract 2 from each edge length.
Hoja de indagación en clase y tareas
Q1. A 4x4x4 painted cube is cut into 1x1x1 cubes. How many cubes have zero painted faces?
Answer Key: 8 (specifically (4-2)³ = 2³ = 8)
Q2. Which configuration can NEVER fold into a valid cube?
Answer Key: Nets containing a 2x2 square ('Tian' shape) or U-shaped concave indentations
Preguntas frecuentes y errores conceptuales
What is the mnemonic rule for identifying the 11 valid cube nets?
Mnemonic: 6 variations of 1-4-1, 3 of 2-3-1, 1 of 2-2-2 (staircase), 1 of 3-3; any 2x2 block or concave U-pocket immediately fails!