# Cube

Written by Jerry Ratzlaff on . Posted in Solid Geometry

• Cube (a three-dimensional figure) is a regular polyhedron with square faces.
• All edges are the same length.
• All faces are squares
• Diagonal is a line from one vertices to another that is non adjacent.
• Circumscribed sphere is a polyhedron is a sphere that contains the polyhedron and touches each of the ployhedron's vertices.
• Inscribed sphere - A convex polyhedron is a sphere that is contained within the polyhedron and tangent to each of the polyhedron's faces.
• Midsphere is a polyhedron is a sphere that is tangent to every edge of the polyhedron.
• 4 base diagonals
• 24 face diagonals
• 4 space diagonals
• 12 edges
• 6 faces
• 8 vertex

### Circumscribed Sphere Radius of a Cube formula

$$\large{ R = a \; \frac{ \sqrt {3} }{2} }$$

Where:

$$\large{ R }$$ = circumscribed sphere radius

$$\large{ a }$$ = edge

### Circumscribed Sphere Volume of a Cube formula

$$\large{ C_v = \frac{3}{4} \; \pi \; \left( a\; \frac{ \sqrt {3} }{2} \right) ^3 }$$

Where:

$$\large{ C_v }$$ = circumscribed sphere volume

$$\large{ a }$$ = edge

$$\large{ \pi }$$ = Pi

### Edge of a Cube formula

$$\large{ a = \sqrt { \frac { A_{surface} } { 6 } } }$$

$$\large{ a = V^{1/3} }$$

$$\large{ a = \sqrt { 3 } \; \frac { D' } {3} }$$

Where:

$$\large{ a }$$ = edge

$$\large{ A_{surface} }$$ = surface face area

$$\large{ V }$$ = volume

$$\large{ D' }$$ = space diagonal

### Face Area of a Cube formula

$$\large{ A_{area} = a^2 }$$

Where:

$$\large{ A_{area} }$$ = face area

$$\large{ a }$$ = edge

### Inscribed Radius of a Cube formula

$$\large{ r = \frac{a}{2} }$$

Where:

$$\large{ r }$$ = inside radius

$$\large{ a }$$ = edge

### Inscribed Sphere Volume of a Cube formula

$$\large{ I_v = \frac{3}{4} \; \pi \; \left( \frac{ a }{2} \right) ^3 }$$

Where:

$$\large{ I_v }$$ = circumscribed sphere volume

$$\large{ a }$$ = edge

$$\large{ \pi }$$ = Pi

### Midsphere Radius of a Cube formula

$$\large{ r_m = \frac{a}{2} \sqrt {2} }$$

Where:

$$\large{ r_m }$$ = midsphere radius

$$\large{ a }$$ = edge

### Space Diagonal of a Cube formula

$$\large{ D' = \sqrt {3} \;a }$$

Where:

$$\large{ D' }$$ = space diagonal

$$\large{ a }$$ = edge

### Surface face Area of a Cube formula

$$\large{ A_{surface} = 6\;a^2 }$$

Where:

$$\large{ A_{surface} }$$ = surface face area

$$\large{ a }$$ = edge

### Surface to volume ratio of a Cube formula

$$\large{ S_v = \frac{6}{a} }$$

Where:

$$\large{ S_v }$$ = surface to volume ratio

$$\large{ a }$$ = edge

### Volume of a Cube formula

$$\large{ V = a^3 }$$

Where:

$$\large{ V }$$ = volume

$$\large{ a }$$ = edge

Tags: Equations for Volume