Definitions of Square Dance Calls and Concepts
Trapezoid Formation [C3B]
 
 

A Trapezoid is a Distorted 2 x 2 that can be formed from a normal 2 x 2 after any two adjacent dancers each move a distance of one matrix position directly away from each other.

From a 2 x 4, there are two Trapezoids. The Ends of one side work with the Centers of the other side within a Distorted Box.

Trapezoid Formation:
 

   
From here... imagine you are here... or here.

Notes:
  • The traffic pattern for some Trapezoid calls can be horrendous. Use Stars as necessary and try to get to your ending position without colliding with any other dancers.
  • Calls must end on original Trapezoid footprints. Shape-changing calls are not allowed.

Trapezoid Couple Up:
 
 
before
Trapezoid Couple Up
 after

Once Removed Trapezoid Counter Rotate 1/4:
(This is very difficult, even at C4)
 
 
before
Once Removed Trapezoid
Counter Rotate 1/4
 after

See also Magic Line | Wave CONCEPT [C3B] which (from Parallel Lines) involves the same footprints, but dancers work within a Distorted Line instead of a Distorted Box.

https://www.ceder.net/def/trapezoid.php -- Copyright © 2019 Vic Ceder.  All Rights Reserved.