#All right triangles are isosceles full#

#All right triangles are isosceles full#

Count how many ways the triangle will fit into its outline in a full turn (360°).

This gives the number of lines of symmetry of the 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.

Different numbers of hash marks indicate different lengths.

The same number of hashes indicate equal lengths.

To classify a triangle using comparative lengths or angles: in vertices close vertex The point at which two or more lines intersect (cross or overlap). The same number of marks indicate angles are equal in size. Recognise that arcs close arcs (annotation) Curved marks inside the vertex of a shape.The same number of marks indicate equal lengths. Recognise that hash marks close hash marks Short lines marked on the side or edge of a shape.Recognising line symmetry and rotational symmetry will also help. Understanding different types of angles and that angles in a triangle sum to 180° can be helpful when classifying a triangle. Other properties relate to the symmetry that the triangle has.are used to represent angles of equal measure. at vertices close vertex The point at which two or more lines intersect (cross or overlap).

Arcs close arcs (annotation) Curved marks inside the vertex of a shape.are used to represent segments of equal length on diagrams. Hash marks close hash marks Short lines marked on the side or edge of a shape.These properties can be annotated on a diagram: 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.