Equilateral Triangle Construction Using Circle Radius

Author:Heather Osting, Steve Phelps

Play through the construction of the equilateral triangle. What does the number in the center of the triangle represent? How can you now prove this construction produces an equilateral triangle?

New Resources

Perpendicular Lines: Quick Exploration
Pythagorean Template: Integer Legs
Congruent Figures
Congruent Sides & Angles in △s: Exploration
挂谷问题——三尖瓣形

Discover Resources

Finding Pi
เรือน้อยคอยรัก
Can you fit the four pieces into the square? Why?
Implicit differentiation on a unit circle
Dihedral angle - lateral faces

Discover Topics

Functions
Pie Chart or Circle Chart
Sine
Power Functions
Scalene Triangles