 ### 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…  