Page 35 - Key Stage 3 Geometry

Exercise 3.1: A Regular Triangle in a Circle

A triangle with three equal sides is called an
equilateral triangle and the internal angles are the

o
o
same – each being 60 adding up to 180 .
Do the following:

1. Using your compasses, draw a circle of radius

5cm.

2. Draw a vertical diameter.
3. Position the compasses point on the south point

and draw an intersection arcs through the

circumference on the left and on the right.

4. Using one of your colour pens, connect the two

intersections points and the north point.

5. You have your equilateral triangle.

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