We recommend you are comfortable with the topics below before you start the selected video.
Know that the sum of the angles on a straight line is 180 degrees and angles around a point 360 degrees.
Know that the sum of the angles in a triangle is 180 degrees.
Appreciate that base angles of an isosceles triangle are equal.
Understand angles properties of a quadrilateral.
Recognise vertically opposite, alternate, corresponding and cointerior angles.
will not interrupt what you are doing.