Thales theorem calculator and converse
Calculate a missing length with Thales’ theorem or test parallel lines with its converse.
A, M, B are assumed collinear in that order, and A, N, C collinear in that order.
The selected field is calculated automatically once three compatible lengths are available.
Enter the counterpart of the unknown and one complete corresponding pair. Small lengths must be shorter than their full lengths.
Enter AM, AB, AN and AC with AM < AB and AN < AC.