Richard Francisco
"Laziness is a
Virtue"
-Emery Finkelstein

Centroid

Orthocenter

Circumcircle and
circumcenter

Incircle and incenter

Medial triangle

Mid-segment triangle.

Orthic triangle

Pedal triangle

Center of Nine
point circle

Nine Point Circle

Trisecting a line segment

Equilateral triangle,
given a side

Square, given a side

Triangle Centers with
Euler Line

Divide a segment
AB into two parts that form a golden ratio.

Hexagon, given a
side.

Octagon, given a
side.