Prove two triangles are congruent by showing they satisfy one of four criteria. Find missing lengths by using the scale factor. The relationship between similar shapes may be expressed as a ratio.

1. Complete the following statements: (a) Two line segments are congruent if _____. (b) Among two congruent angles, one has a measure of 70°; the measure of the other angle is _____. (c) When we write ...

iv) (Motivate) Equal chords of a circle (or of congruent circles) are equidistant from the centre (s) and conversely. v) (Prove) The angle subtended by an arc at the centre is double the angle ...

These reflected rectangles are example of congruent shapes. When transforming a shape, either through translation, reflection or rotation, a congruent shape is produced. Enlargements create shapes ...