Posts by: Barrie Barnard
Activity 1: Finding the centre of the circle
You will need a cut-out paper circle (about 12cm diameter).
Use a circle that does not show the centre. Fold your circle along a diameter. Mark the ends A and B. Now unfold your circle and then fold again along a different diameter and mark the […]
We start from this definition:
A parallelogram is a quadrilateral with both pairs of opposite edges parallel.
In this investigation you will discover some other properties of parallelograms.
Step 1: Use two different width rulers to draw a parallelogram on tracing or baking paper.
Make sure that it is […]
Radio and TV stations broadcast from high towers. Their signals are picked up by radios and TV’s in houses within a certain radius. Because the Earth is spherical, these signals do not get picked up beyond the point of contact of the near horizontal tangent line as illustrated in the sketch.
What is the […]
Investigate quadrilaterals that have inscribed circles as shown in the diagram.
Draw a circle with any radius you choose, and then draw 4 tangents making a quadrilateral with the circle inside touching the quadrilateral at 4 points.
Measure the edge lengths of the quadrilateral ABCD.
What do you notice?
Copy the table […]
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