### Ring Sprung Into Place

Illustration of ring (small circle in larger concentric circle) sprung into place.

### Connecting Rod of a Steam Engine

This illustrates how to determine the force required to turn a connecting rod of a steam engine.

### Circle with Secant

A secant is "a line which cuts a figure in any way. Specifically, in trigonometry, a line from the center…

### Sector

"In geometry: (a) A plane figure inclosed between the arc of a circle, ellipse, or other central curve…

### Circle Sector

An illustration showing a circle sector with radius r, center/central angle v, and length of circle…

### Circle Sector

An illustration showing a circle sector with center/central angle v and polygon angle w.

### Circle Sector

An illustration showing a circle sector with height of segment h and radius r.

### Semicircle

Illustration of a semicircle.

### Semicircle With Chords and Radii

Illustration of a semicircle with chords and radii.

### Sphere With 8-inch Diameter Cut by Planes

An 8-inch sphere cut by parallel planes, one 2 inches from center and the other 6 inches from center.…

### Sphere Inside of Cylinder.

An illustration of a sphere inside of a cylinder with radius/diameter labeled. Illustration for showing…

### Sphere With Tangent Plane

Illustration of a sphere with a tangent plane. "A plane perpendicular to a radius at its extremity is…

### Sphere With Tangent Plane

Illustration of a sphere with a tangent plane. "A plane perpendicular to a radius at its extremity is…

### Sphere With a Radius of 1 foot

An illustration of a sphere showing a radius of 1 foot. Illustration could be used for calculating volume.

### Zones or Segments of Spheres

An illustration of a zone of a sphere. A zone occurs when a sphere is cut by parallel planes that are…

### Zones or Segments of Spheres

An illustration of a zone of a sphere. A zone occurs when a sphere is cut by parallel planes that are…

### Flanged Spherical Segment

An illustration of a flanged spherical segment with a diameter of 10 inches. Illustration could be used…

### Construction Of A Square Circumscribed About A Circle

An illustration showing how to construct a square circumscribed about a circle. "Draw the diameters…

### Construction Of A Square Inscribed In A Circle

An illustration showing how to construct a square inscribed in a circle. "Draw the diameter AB, and…

### Point of Tangency

Illustration of radius drawn to point of contact of a tangent.

### Construction Of Tangent To 2 Circles

An illustration showing how to construct a tangent to 2 given circles of different diameters. "Join…

### Circle Inscribed In A Triangle

An illustration showing a circle with radius r inscribed in a triangle with sides a, b, and c.

### Circle Inscribed In A Triangle

An illustration showing a circle with sectors D and E inscribed in a triangle with angles, A, B, and…

### Ulna

Anterior view of the ulna (bone of the arm) of the left side. Labels: 1, olecranon process; 2, greater…

"The ulna, or elbow bone, is the larger of these two bones. It is joined to the humerus by…

### The Human Ulna and Radius

The Ulna and Radius. Labels: 1, radius; 2, ulna; o, olecranon process, on the anterior surface of which…

### Fractured Ulna with Dislocation of Radius

Fracture of upper third of ulna, with dislocation of radius forward.

### Side View of a Vehicle Wheel

A wheel is a circular device that is capable of rotating on its axis, facilitating movement and transportation.

### Vertebrate Fore Limb

"Ideal fore limb. H., Humerus; R., radius; U., ulna; r'., radiale; u'., ulnare; i., intermedium; c.,…

### Vulture Skeleton

"Skeleton of Egyptian Vulture. (Neophron percnopterus), to show bones of bird. a, post-orbital process;…

### Ligaments of the Wrist

Ligaments on anterior aspect of radio carpal, carpal, and carpo metacarpal joints.

### Transverse Section Through the Wrist

Transverse section through the wrist, showing the annular ligaments and the canals for the passage of…