we need to know what fraction of the circle is shown. To do this, we use the angle and compare it with 360˚. This angle is 144°. That is \(\frac{{144^\circ }}{{360^\circ }} = \frac{2}{ ...

More simply, opposite angles in a cyclic quadrilateral add up to 180°. A tangent is a straight line which touches the circle at a point but does not cut through the circle. There are two theorems ...

The activities focus on spatial reasoning and geometry, which are often taught during the last few months of the school year, and which provide important foundations for mathematics reasoning more ...