trapezoid multi-start thread ring
trapezoid single start thread ring
sharp V-thread (full V-thread)
V-thread (triangular thread)
anti-trapezoid ridge waveguide
area of trapezoid with curved edge
area, area side trapezoid
circle trapezoid graphs
circular trapezoid graphs
Combined trapezoid spray tray
compound trapezoid formula
Curved member with trapezoid section
curvilinear trapezoid distribution
equivalent dual-trapezoid curve
Generalized Trapezoid-shaped
generalized trapezoid-shaped GTS function
generalized trapezoid-shaped(GTS) function