Geometry Toolbox

Ideas for activities

Angles in a Triangle

Show that when you move the points of a triangle the angles always sum to 180o

Angles in a triangle

Angle in a Semicircle

Show that the angle drawn in at the circumference from either ends of the diameter is always 90o.

Angle in a semicircle

Polygons

Make a poster showing the basic polygons and their names. For example

Triangle

Quadrilateral

Pentagon

Hexagon

Heptagon

Parallel Lines

Move intersecting parallel lines to show that alternate, vertically opposite and corresponding angles are always equal.

Parallel Lines

Tangram

Accurately construct the perfect Tangram puzzle after first calculating the required lengths and angles.

Tangram

Rotational Symmetry

Rotational Symmetry

Triangle Centres

Research different ways of finding the centre of a triangle. Investigate the conditions under which at least two of the following coincide:

Centroid

Circumcenter

Incenter

Orthocenter.

Unit Circle

Show the relationship between sine and cosine in a dynamic unit circle.

Trigonometry

Transformations

Find the transform tools then make dynamic diagram showing what each type of transformation looks like.

Transformations

Related activities

Suggested

Angle Chase

Angle Chase

Find all of the angles on the geometrical diagrams. Use your knowledge of basic angle theorems.

The short web address is:

Transum.org/go/?to=chase

Recommended

Area Two

Area Two

How many different shapes with an area of 2 square units can you make by joining dots on this grid?

The short web address is:

Transum.org/go/?to=area2

Advocated

Polygon Angles

Polygon Angles

A mixture of problems related to calculating the interior and exterior angles of polygons.

The short web address is:

Transum.org/go/?to=polyang

Noted

Circle Theorems Exercise

Circle Theorems Exercise

Show that you understand and can apply the circle theorems with this self marking exercise.

The short web address is:

Transum.org/go/?to=circleangles


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Getting started with GeoGebra Geometry

The helpful video above was made by Professor Caine

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