Two angles are the same size., and scalene triangles close scalene triangle Each side is a different length. All angles are 60°., isosceles triangles close isosceles triangle Two sides are equal in length. Examples, solutions, videos, games, activities and worksheets to help SAT students review properties of equilateral and isosceles triangles. This gives the order of rotational symmetry.Ī unique set of properties relating to the comparative length of its sides and the comparative size of its angles help to identify equilateral triangles close equilateral triangle All sides are equal in length. Count how many ways the triangle will fit into its outline in a full turn (360°).Lengths of 2 cm, 5 cm and 9 cm do not make a triangle. The total sum of the two shorter lengths must be greater than the longest length. This gives the number of lines of symmetry of the triangle. Three lengths are needed to form a triangle. Count how many ways the triangle can be cut into a pair of mirrored halves.Different numbers of arcs indicate different angles.The same number of arcs indicate equal angles.
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These properties can be annotated on a diagram:
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with three straight edges is a triangle close triangle A three-sided polygon.Ī triangle is classified by the comparative length of its edges close edge Side of a polygon or a 3D shape. Any polygon close polygon A closed 2D shape bounded by straight lines.