Well-known planar four-bar linkages:

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Try the following:

• Change tMag to 1.5 and tAngDegree to 75 in the Watt configuration and press the Update button.
• Change tMag to -1.0 in the Chebyshev configuration and press the Update button.
• Change tMag to -0.7 in the Hoekens configuration and press the Update button.

Note: If we fix the orientation of the first (p) bar, the second (q) and the third (r) bars can have two different configurations. One is shown in red and the other in green.