A circle inscribed in a triangle Student activity Play

A triangle and circles Student activity Play

An interesting formula to find the area of a polygon Student activity Play

An interesting formula to find the area of a polygon Whiteboard exercise Play

Area of a polygon Animation Play

Area of rectangles Whiteboard presentation Play

Area of rectangles Class activity Play

Building a rectangle Whiteboard exercise Play

Building the polygon with the shortest possible perimeter Simulation Play

Calculating length Whiteboard exercise Play

Calculating length and distance Student activity Play

Calculating the length of a side of a square Whiteboard exercise Play

Calculating the perimeter of a rectangle Whiteboard exercise Play

Calculating the perimeter of a square Whiteboard exercise Play

Calculations involving π Animation Play

Circumference of a circle Student activity Play

Circumference of a circle Animation Play

Construction of a square with given perimeter Simulation Play

Doilies in the shape of polygons Whiteboard exercise Play

Examples of algebraic expressions Animation Play

Examples of regular polygons Student activity Play

Explain and justify Class activity Play

Explain and justify Whiteboard presentation Play

Finding the exact values of trigonometric ratios for selected angles Student activity Play

Finding the perimeter of the polygon Whiteboard exercise Play