Images under symmetry Animation Play

Inscribed angle in a semicircle Student activity Play

Inscribed circles, circumscribed polygons Student activity Play

Interesting information Animation Play

Interesting problems Student activity Play

Is a practical demonstration reliable? Whiteboard exercise Play

Is a practical demonstration reliable? Student activity Play

Isosceles trapeziums Simulation Play

Isosceles triangles Whiteboard exercise Play

Isosceles triangles Whiteboard exercise Play

Isosceles triangles and symmetry Student activity Play

Isosceles triangles and symmetry Whiteboard exercise Play

Isosceles triangles – solving problems Student activity Play

Isosceles triangles – solving problems Whiteboard exercise Play

Isosceles triangles – solving problems Whiteboard exercise Play

Kinds of triangles – classification by angles Student activity Play

Kinds of triangles – classification by angles Simulation Play

Kinds of triangles – classification by angles and sides Simulation Play

Kinds of triangles – classification by sides Simulation Play

Kinds of triangles – classification by sides Student activity Play

Lena's way Animation Play

Making a triangle Animation Play

Match a triangle Student activity Play

Match a triangle Whiteboard exercise Play

Miscellaneous problems Student activity Play