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How to Graph and Solve an Equilateral Triangle

An equilateral triangle is defined as a triangle with three equal sides and three equal angles. Since the three angles of a triangle must add to 180 degrees, each angle in an equilateral triangle must always be 60 degrees. The sides of an equilateral triangle can be any length, but all of the sides must always be the same length. Because of these two rules, solving an equilateral triangle (i.e. deducing side length and angles) is fairly simple.

Things You'll Need

  • Paper
  • Pencil
  • Protractor
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Instructions

    • 1

      Set your protractor flat on a piece of paper with the straight side facing you.

    • 2

      Draw a line of any desired length, using the inner edge of the straight side of the protractor.

    • 3

      Draw a dot at the left end of the line, and move your protractor such that the the dot lies in the middle of the protractor's straight edge.

    • 4

      Draw another line with its origin at the dot you made in Step 3. Use the round part of the protractor to draw this second line at 60 degrees to the first line.

    • 5

      Repeat Steps 3 and 4 for the third side of the triangle, connecting this final line to the line you drew in Step 2.

    • 6

      Erase any excess pencil markings to complete your equilateral triangle.

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