with Diego Forlan

F = 6

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Equation

F + C – E =

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Equation

6 + 8 – 12 = 2

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21286

= ? E CF

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and a football

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= ? E CF

Fill in the table©

6

= ? E CF

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How many Corners?

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C = ©

C = 8 ©

6

= ? E CF

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86

= ? E CF

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How many Edges?

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E =

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E = 12

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86

= ? E CF

©

1286

= ? E CF

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Equation

6 + 8 – 12 =

©

A Pyramid

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F = ©

F = 4 ©

4

21286

= ? E CF

©

C = ©

C = 4 ©

44

21286

= ? E CF

©

E = ©

E = 6 ©

644

21286

= ? E CF

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Equation

F + C – E =

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Equation

4 + 4 – 6 =

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Equation

4 + 4 – 6 = 2

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644

21286

= ? E CF

©

2644

21286

= ? E CF

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For homework see whether you can do the same calculation

for

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an icosahedron

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Project Algebra and Geometry Algebra and Geometry are easy. Here is an equation. Fill in the empty squares and solve the equation. F stands for the number of faces, C for the number of corners and E for the number of edges for a shape. For a cube F = 6. Could anything be easier? When you have worked out F, C and E for a shape you can solve the equation.

F + C – E = ?

Faces

Corners

Edges

= ?

Equation

F

C

E

Cube

Pyramid

Icosahedron

Football

What do you notice about the results?

Let’s count the Faces on a cube

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Use the letter F for the number of Faces

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How many Faces?

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F =

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Learn Algebra

How many Corners?

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4 on top

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4 on the bottom©

1

©

1 2

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1 2

3

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1 24

3

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1 24

3

5

©

1 24

3

5

6 ©