 Learning concepts for Lines
 Ray / Segment Rays are infinite in one direction; segments have ends.
 Parallel Lines that are always the same distance apart.
 Intersecting Lines that cross at exactly one point.
 Transversal Line that cuts across more than one line.
 Learning concepts for Angles
 Types Identify acute, right, obtuse and straight angles.
 Size Angles are measured in degrees e.g. 45°.
 Equal Angles that are the same size: vertically opposite and alternate angles.
 Supplementary Two angles that add up to 180° e.g. adjacent angles on a straight line.
 Alternate Alternate angles formed by the transversal of parallel lines are equal.
 Corresponding Corresponding angles formed by the transversal of parallel lines are equal.
 Cointerior Cointerior angles formed by the transversal of parallel lines are supplementary.
 Learning concepts for Triangles
 Definition A triangle has three sides. Its interior angles add up to 180°.
 Types Rightangled, equilateral, isosceles triangles.
 Learning concepts for Congruence
 Definition When triangles are identical (same shape and size), they are congruent.
 Reflection Triangles remain congruent, whether moved, rotated or reflected.
 Requirements Minimum requirements for congruence include three sides, two sides and an angle, two angles and a side or a 90° angle and the hypotenuse and a side.
 Learning concepts for Similarity
 Definition Similar triangles have the same shape: their corresponding angles are equal and their corresponding sides are in proportion.
 Requirements The minimum requirement for similarity is for two of the three corresponding angles to be equal.
 Enlarge/Reduce Enlargements and reductions change the size of triangles, but not the shape.
 Parallel When two parallel lines are cut by two transversals that form two triangles, then the triangles are similar.
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