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Important note: These are particular cases in which we do not need trigonometry to solve the exercise. If you need to solve a case with different angles, ask me in the comments. The perimeter of a circular segment is calculated as the sum of the two lines that delimit it: The length of the chord: in this video I choose two cases in which the use of trigonometry is not needed, thanks to the fact that it forms triangles with the radii that are easy to solve. The length of the arc: To avoid memorizing unnecessary formulas, I solve by proportions / rule of 3. We can also realize that the arc is a simple fraction of the circumference in these cases, since it would be 1/6 in the first case and 1/4 in the second.