How do you find the ratio? Student activity Play

How high is the tree? Student activity Play

How high is the tree? Whiteboard exercise Play

How is the Sierpinski Gasket formed? Animation Play

How to calculate the volume of prism Animation Play

How to check directly whether two triangles are congruent Student activity Play

How to check directly whether two triangles are congruent Whiteboard exercise Play

How to construct an equilateral triangle Student activity Play

How to construct an equilateral triangle Animation Play

How to construct an isosceles triangle Student activity Play

How to draw a triangle symmetrical to a given point Animation Play

How to use the speed equation triangle Animation Play

Image of a figure (reflection in the x-axis) Animation Play

Images of figures Animation Play

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

Kinds of triangles – classification by angles Simulation Play

Kinds of triangles – classification by angles Student activity Play

Kinds of triangles – classification by angles and sides Simulation Play

Kinds of triangles – classification by sides Simulation Play