Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to classify triangles [title] Measure each side of the 3 sides of the triangle using a ruler. [title] Place the ruler at the end of each line segment of the 3 lines in the triangle and measure to the opposite endpoint of each line. [title] Make note of the measurement for each of the 3 triangle sides.

Ending1: [title] In order to find the center of one side of the triangle, fold down two copies of each side's length. [title] Divide the two strips vertically into the same square space. Ending2: [title] Using a ruler, record where each triangle is and the length from each side. [title] Take a measurement from each line segment of the triangle and where two are equivalent. Ending3: [step] The result will serve two purposes--the hydrogen peroxide cut will be the hydrogen peroxide cut and the hydrogen peroxide cut. [substeps] Since hydrogen peroxide cut will be peroxide marked, a hydrogen peroxide cut will appear as hydrogen peroxide cut down. Ending4: [title] Determine how the 3 sides compare in length. [step] Inspect to see if some lines are longer than others in length and if any of the lines are equal in length.

Answer format: ending1/ending2/ending3/ending4