### Center of Gravity

"In a body of equal thickness, as a board, or a slab of marble, but otherwise of an irregular shape,…

### Center of Gravity

"When such a surface is irregular in shape, suspend it at any point, so that it may move freely, and…

### Center of Gravity of an Irregular Plane

"To find the center of gravity of any irregular plane figure, but of uniform thickness throughout, divide…

### Center of Gravity of a Solid

"In a body free to move, the center of gravity will lie in a vertical plumb-line drawn through the point…

### Irregular Convex Decagon

Illustration of an irregular convex decagon. This polygon has some symmetry.

### Irregular Convex Decagon

Illustration of an irregular convex decagon. This polygon has some symmetry.

### Irregular Convex Decagon

Illustration of an irregular convex decagon. This polygon has some symmetry.

### Irregular Convex Decagon

Illustration of an irregular convex decagon. This polygon has some symmetry.

### Irregular Convex Decagon

Illustration of an irregular convex decagon. This polygon has some symmetry.

### Irregular Convex Dodecagon

Illustration of an irregular convex dodecagon. This polygon has some symmetry.

### Irregular Convex Dodecagon

Illustration of an irregular convex dodecagon. This polygon has some symmetry.

### Irregular Convex Dodecagon

Illustration of an irregular convex dodecagon. This polygon has some symmetry.

### Irregular Concave Heptagon

Illustration of an irregular concave heptagon.

### Irregular Convex Heptagon

Illustration of an irregular convex heptagon. This polygon has some symmetry.

### Irregular Convex Heptagon

Illustration of an irregular convex heptagon. This polygon has some symmetry.

### Irregular Convex Heptagon

Illustration of an irregular convex heptagon. This polygon has some symmetry.

### Irregular Convex Heptagon

Illustration of an irregular convex heptagon. This polygon has some symmetry.

### Irregular Convex Heptagon

Illustration of an irregular convex heptagon.

### Irregular Concave Hexagon

Illustration of an irregular hexagon. This is also an example of a concave polygon.

### Irregular Concave Hexagon

Illustration of an irregular hexagon. This is also an example of a concave polygon with symmetry.

### Irregular Concave Hexagon

Illustration of an irregular hexagon. This is also an example of a concave polygon with symmetry.

### Irregular Concave Hexagon

Illustration of an irregular hexagon. This is also an example of a concave polygon with symmetry.

### Irregular Convex Hexagon

Illustration of an irregular convex hexagon.

### Irregular Convex Hexagon

Illustration of an irregular convex hexagon with symmetry.

### Irregular Curves

"Curves other than arcs of circles are drawn with the pencil or ruling pen by means of curved or irregular-shaped…

### Irregular Concave Nonagon

Illustration of a nonregular/irregular convcave nonagon. A nonagon is a closed geometric figure with…

### Irregular Concave Nonagon

Illustration of a nonregular/irregular convcave nonagon. A nonagon is a closed geometric figure with…

### Irregular Concave Nonagon

Illustration of a nonregular/irregular convcave nonagon. A nonagon is a closed geometric figure with…

### Irregular Convex Nonagon

Illustration of a nonregular/irregular convex nonagon. A nonagon is a closed geometric figure with 9…

### Irregular Convex Nonagon

Illustration of a nonregular/irregular convex nonagon. A nonagon is a closed geometric figure with 9…

### 2 Congruent Rotated Nonagons

Illustration of 2 regular congruent nonagons that have the same center. One nonagon has been rotated…

### Irregular Concave Octagon

Illustration of an irregular concave octagon. This polygon has some symmetry.

### Irregular Concave Octagon

Illustration of an irregular concave octagon.

### Irregular Concave Octagon

Illustration of an irregular concave octagon. This polygon has some symmetry.

### Irregular Concave Octagon

Illustration of an irregular concave octagon. This polygon has some symmetry.

### Irregular Convex Octagon

Illustration of an irregular convex octagon. This polygon has some symmetry.

### Irregular Convex Octagon

Illustration of an irregular convex octagon. This polygon has some symmetry.

### Irregular Convex Octagon

Illustration of an irregular convex octagon.

### Irregular Convex Octagon

Illustration of an irregular convex octagon. This polygon has some symmetry.

### Irregular Convex Octagon

Illustration of an irregular convex octagon. This polygon has some symmetry.

### Irregular Concave Pentagon

Illustration of an irregular pentagon. This is also an example of a concave polygon with symmetry.

### Irregular Concave Pentagon

Illustration of an irregular concave pentagon.

### Irregular Convex Pentagon

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

### Irregular Convex Pentagon

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

### Irregular Convex Pentagon

Illustration of an irregular convex pentagon.

### Irregular Convex Polygon

Illustration of an irregular convex polygon with 16 sides that has symmetry. It could be used to show…

### Quadrilateral With Diagonals

Illustration of a quadrilateral with diagonals AC and BD.

### Irregular Reflection or Diffusion

"Irregular reflection or diffusion results from the incidence of radiant energy upon an irregular surface,…