A circle inscribed in a triangle Student activity Play

A rhombus, a parallelogram and a trapezium in coordinates Whiteboard exercise Play

A trapezium and a kite Animation Play

A trapezium and a kite – conclusions Whiteboard exercise 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

Angles and sides of quadrilaterals Student activity Play

Angles in a trapezium Whiteboard exercise Play

Angles in simple polygons Whiteboard presentation Play

Angles in simple polygons Class activity Play

Angles of quadrilaterals Student activity Play

Application of the Pythagorean theorem in 2-D Class activity Play

Application of the Pythagorean theorem in 2-D Whiteboard presentation Play

Applying the trapezium rule Animation Play

Applying the trapezium rule for a different number of sub-intervals Whiteboard exercise Play

Approximating area by rectangles and trapeziums Whiteboard exercise Play

Approximating area by rectangles and trapeziums Student activity Play

Approximating area by trapeziums Whiteboard exercise Play

Approximating area by trapeziums Student activity Play

Approximating the area Student activity Play

Approximating the area under a line in the coordinate system Student activity Play

Approximating the area using strips Animation Play

Approximation of the area under a curve Whiteboard presentation Play

Area of a polygon Animation Play