2 congruent circles whose intersection includes a tangent circle with diameter equal to the radii of…

A large circle containing 2 smaller congruent circles. The small circles are externally tangent to each…

A large circle containing 2 smaller congruent circles. The small circles are externally tangent to each…

A regular hexagon containing 7 congruent circles. The circles are externally tangent to each other and…

Illustration used to show how "to construct a common external tangent to two given circles."

Illustration used to show how to construct two common external tangents to two given circles.