This is a portal from teachers to teachers.
Share your activities and see them featured here!
Centres of a Triangle
Construct some of the centres of a triangle and investigate relationships between them, discovering the Euler Line
Publisher: Texas Instruments UK
Editor: Barrie Galpin
Tags: Circles, Zeros, Geometry
Experience reflection dynamically: relationships between the object, the image and the position and orientation of the mirror.
Author: Jay Timotheus
Tags: Reflection, Geometry
A dynamic approach to enlargement and similarity
Tags: Geometry, 2D shapes
Squaring the Circle
The classic geometry problem of "squaring the circle"
Author: Adrian Oldknow
Tags: History of maths, Geometry
Mediators of Triangles
Investigate where mediators of different triangles meet
A square is dissected to form three triangles and a quadrilateral. What fraction of the square is each part?
Tags: Fractions, Scattergraphs, Algebra, Geometry
Connecting Algebra, Geometry and Graphs
Move from words to symbols, to geometric representations, to plotted points and finally to graphs.
Author: Allan Duncan
Tags: Linear, Quadratic, 2D shapes, Letters and symbols, Geometry, Algebra
Seven activities in which students investigate angles in circles using basic geometric constructions.
Tags: Angles, Circle theorems, Geometry
Enlargement/reduction from the origin (template)
A ready-made Graphs page for enlargements centred at the origin.
Editor: Christopher Rath
Tags: Enlargement and reduction, Geometry
Investigate relationships between radii of the semicircles and the perimeter and area of this interesting shape
Tags: Perimeter, Area, Circles, Geometry
Dimensions of a Circle
Derive the formulae for the circumference and area of a circle using multiple representations.
Tags: Circumference, Area, Circles, Geometry
Investigate shapes formed by joining mid-points of adjacent sides of a quadrilateral.
Tags: 2D shapes, Geometry