Gr 9 (Geometry)

GEOMETRY OF STRAIGHT LINES

Angle relationships

● Revise and write clear descriptions of the relationship between angles formed by:

      ● perpendicular lines

      ●  intersecting lines

       ● parallel lines cut by a transversal

Solving problems

● Solve geometric problems using the relationships between pairs of angles described above

GEOMETRY OF 2D SHAPES

Classifying 2D shapes

● Revise properties and definitions of triangles in terms of their sides and angles, distinguishing between:  equilateral, isosceles and right-angled triangles

● Revise and write clear definitions of quadrilaterals in terms of their sides, angles and diagonals, distinguishing between:

 ●    Parallelogram, rectangle, square, rhombus ,Trapezium, kite

GEOMETRY OF 2D SHAPES

Similar and congruent triangles

● Through investigation, establish the minimum conditions for congruent triangles

● Through investigation, establish the minimum conditions for similar triangles

Solving problems

● Solve geometric problems involving unknown sides and angles in triangles and quadrilaterals, using known properties of triangles and quadrilaterals.