Look for arcs inside each vertex. The same number of arcs indicate equal angles. Different numbers of arcs indicate different angles. To identify the symmetry of a triangle: Count how many ways ...

Learn about properties of triangles with this BBC Bitesize Maths article. For students between the ages of 11 and 14. ... Arcs close arcs (annotation) Curved marks inside the vertex of a shape.

The tetrahedron has 3 triangles connecting at each vertex, resulting in 4 total triangles, while the octahedron has 4 triangles connecting at each vertex (8 total triangles), and the icosahedron ...