Constructions and Scale Drawing

Scheme of work: Key Stage 3: Year 8: Term 5: Constructions and Scale Drawing

Know angles are measured in degrees: estimate and compare acute, obtuse and reflex angles
Draw given angles, and measure them in degrees (°)
identify:
- angles at a point and one whole turn total 360°
- angles at a point on a straight line total 180°
- other multiples of 90°
recognise angles where they meet at a point, are on a straight line, or are vertically opposite, and find missing angles

You use different methods to draw triangles depending on what informationÂ you are given.
- Side, Side, Side is constructed using a pair of compasses and a ruler
- Angle, Side, Angle is constructed using a protractor and ruler.
- Side, Angle, Side is constructed using pair of compasses, a protractor and a ruler.
The perpendicular bisector of a line is a line that divides the first line into two
equal lengths and is at right angles to it.
The angle of elevation is the angle between the horizontal line of sight and the object. The angle of depression is the angle between the line looking straight ahead and the line looking down at the object.
A bearing is a compass direction. A three figured bearing is a clockwise angle measured from North. North lines are parallel.
The bisector of an angle is the line or line segment that divides the angle into two equal parts.

Develop fluency
- Use language and properties precisely to analyse 2-D and 3-D shapes.
Reason mathematically
- Begin to reason deductively in geometry using geometrical constructions.
Solve problems
- Begin to model situations mathematically and express the results using a range of formal mathematical representations.
- Select appropriate concepts, methods and techniques to apply to unfamiliar and non-routine problems.