### Circle With Sector and Segment labeled

Illustration of circle with sector and segment used to find area.

### Circle With Sector and Segment labeled

Illustration of partial circle with sector and segment used to find area.

### Sector of Circle

Illustration of a circle with a sector. "A sector of a circle is the space included between an arc and…

### Sector Of Circle

Illustration of a sector of a circle. A sector is the space between an arc and two radii drawn to the…

### Sector Of A Hollow Circle

Illustration of a sector of a hollow circle. A sector is the space between an arc and two radii drawn…

### Sectors of Circle

Illustration of a circle with 6 equal sectors.

### Circle with Segment, Semicircle, Sector, Quadrant, and Central Angle

Illustrations of a circle with segment, semicircle, sector, quadrant, and central angles drawn.

### Condensing Light

"Fixed Conensing Light for a Single Sector, 1850.â€”The holophote Light pLp throws its whole light on…

### Finger system

"Used with indistinct or invisible targets and to define sectors." — Moss, 1914

### Triangles and Sectors in Quadrant I

Illustration of an angle &alpha with the vertex at the center, O, of a circle with radius OB. AC and…

### Sector

The sector is a hinged rule with scales used for various mathematical calculations.

### 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.

### Sphere With Sectors and Arcs

Diagram of a sphere with sectors and arcs drawn.

### Sphere With Sectors and Arcs

Illustration of a sphere with sectors and arcs.

### Napier's Right Spherical Triangle

Illustration of a right spherical triangle and the five circular parts placed in the sectors of a circle…

### Relationships In A Spherical Triangle

Illustration used, with the law of sines, to find the relation between two sides of a spherical triangle…

### Relationships In A Spherical Triangle

Illustration used, with the law of cosines, to find the relation between the three sides and an angle…

### Relationships In A Spherical Triangle

Illustration used to extend the law of cosines when finding the relation between the three sides and…

### Relationships In A Spherical Triangle

Illustration used to extend the law of cosines when finding the relation between the three sides and…

### Right Spherical Triangle

Illustration of a right spherical triangle with a and b the sides, and α and β the angles…

### Superimposed Symmetrical Spherical Triangles

Diagram showing 2 superimposed symmetrical spherical triangles.

### Symmetrical Spherical Triangles

Diagram showing 2 symmetrical spherical triangles.

### Circle Inscribed In A Triangle

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

### Spherical Triangle

Diagram showing a spherical triangle.

### Spherical Triangle

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

### Spherical Triangle

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

### Spherical Triangle

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

### Two Symmetrical Spherical Triangles

Diagram showing a 2 symmetrical spherical triangles.