1

This year marks my tenth year as a teacher of Maths. During that time, I've built up a bank of teaching resources and ideas which I want to share with others. Some can be incorporated into lessons and others act as discussion points.

2

The majority of posts are focused around Maths, but there are some which look at pedagogy and CPD which can be used in other subjects/settings. Search for lesson resources using the tags at the side. Pedagogy has it's own section.

3

I'm happy for teachers to use my resources in schools, but if they are used for private tuition then I ask that a small portion be donated.

Find the Centre of a Circle using a Rectangle

The Geogebra applet below shows a rectangle and a circle. Using the rectangle and some basic tools, you can find the centre of the circle.


A solution

We know that the angle in a semicircle is 90 degrees. The converse is also true. Use the right angle of the rectangle to identify a diameter. Two diameters intersect at the centre. See below.

Note: This demonstration wasn't accurate. It was more of an exploration into the possible methods for finding the centre of the circle. With more tools, you can construct precise diagrams.

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