Illustration of concentric circles used to find area between two circles (ring).

Illustration of three circles enclosed in an equilateral triangle.

Illustration of equal circles to show that two central angles have the same ratio as their intercepted…

An illustration depicting an infinite sequence of tangent circles with the radius converging to zero.…

Illustration of equal circles to show that an inscribed angle is measured by half the arc intercepted…

Illustration of a circle with a polygon (octagon) and square inscribed.

Illustration showing various circles and the angles formed by intersecting lines.

Illustration showing 2 intersecting circles with a line drawn through each point of intersection terminated…

Illustration showing 2 intersecting circles with a lines drawn that form a triangle.

Illustration of a circle with parallels intercepting equal arcs on a circumference.

A design created by dividing a circle into 4 equal arcs and creating a reflection of each arc toward…

A design created by dividing a circle into 4 equal arcs and reflecting each arc toward the center of…

A design created by dividing a circle into 4 equal arcs and reflecting each arc toward the center of…

A design created by dividing a circle into 4 equal arcs and creating a reflection of each arc toward…

A design created by dividing a circle into 4 equal arcs and creating a reflection of each arc toward…

Illustration of a 6-point star (convex dodecagon) inscribed in a large circle and circumscribed about…

Illustration of an 8-point star (convex polygon) inscribed in a large circle and circumscribed about…

Illustration showing 2 circles with that touch each other and two lines drawn through the point of contact…

Illustration used to show how to pass a circumference through any three points not in the same straight…

Always draw a circle in one stroke, inclining the compass in the direction of the line and rolling the…

Illustration of a circle inside of 2 concentric rectangles whose vertices are connected by line segments.

Cross section of concrete conduit. The diagram can be used to find volume.

Development and top completion exercise problem of the cone by dividing the base into equal parts and…

An exercise problem to complete the top and develop, stretched out, image of the flange and hood cones…

The cone is sliced by a circle in a plane perpendicular to the axis. This can be drawn without knowledge…

Diagram of a cone with spheres and cut by a plane to depict the conic sections.

Diagram of a cone with inscribed spheres and cut by various planes to depict the conic sections: circle,…

Diagram showing how to construct a conic when given the focus and the auxiliary circle. If the focus…

Diagram showing how to construct a conic when given the focus and the auxiliary circle. The focus is…

Diagram showing how to construct a conic when given the focus and the auxiliary circle. As the focus…

Illustration of of construction of an arc when the chord and height of the segment are given.

Illustration used to construct a circle when given two points that it passes through and a radius.

Illustration of a triangle with its incircle and three excircles constructed.

Illustration of the construction used to circumscribe a circle about a given triangle.

Illustration used to construct a common tangent when given two circles.

Illustration of the construction used to escribe circles with centres (centers) called ex-centres of…

Illustration of the construction used to inscribe a circle in a given triangle.

Illustration of of construction of a radius when given only a part of the circumference.

Illustration of of construction of a radius when given only a part of the circumference.

Illustration of the construction used upon a given straight line, to describe a segment of a circle…

Illustration of the construction used to draw a tangent to a given circle through a given point.

An illustration of finding an intersection of a cone and cylinder by either cutting the vertex of the…

An illustration of finding an intersection of a cone and cylinder by either cutting the vertex of the…

An exercise problem in creating a development or rolled out surface of a cylinder in a 4" by 5" drawing…

The illustration shows the cylinder rolled out in a tangent plane of the base to create a development…

Right circular cylinder inscribed in a pentagonal prism. Or, Pentagonal prism circumscribed about a…