 |  | ![1/3[2cost-cos(2t)]](/images/equations/DeltoidInvolute/Inline3.svg) |
(1)
|
 |  | ![1/3[2sint-sin(2t)]](/images/equations/DeltoidInvolute/Inline6.svg) |
(2)
|
is a hypocycloid involute for 
 |  | ![1/9[2cost-cos(2t)]](/images/equations/DeltoidInvolute/Inline10.svg) |
(3)
|
 |  | ![1/9[2sint+sin(2t)],](/images/equations/DeltoidInvolute/Inline13.svg) |
(4)
|
which is another deltoid scaled by a factor 
and rotated 
of a turn.
Deltoid Involute
See also
Deltoid, Deltoid Evolute, InvoluteExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Deltoid Involute." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/DeltoidInvolute.html