Epitrochoid - College of the Redwoods

1. Arc length formula . s=r*t. 2. We can see . arc AC = arc FC. 3. So arc . AC = a*t. and arc . FC = a*t. 4. Angle ABC = t. and . Angle DEC = t. 5. We need to find some . angle n. so we can calculate the parametric equation of point . P some distance h from the center of the rolling circle. Angle m = (a*t)/b. Angle n = m + t = (a*t)/b + t = (a*t)/b + (b*t)/b = ((a+b)/b) * t. 6. ................
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