Trigonometry Missing Angles
This article explores trigonometry missing angles. This article explores how to use the formulae for sin, cos and tan to find the missing angles. Measuring angles Trigonometry helps us to calculate angles in shapes....
Category: Shape
Sum of Angles in a Polygon
This chapter explores sum of angles in a polygon. The objectives of this chapter are; to be able to understand and use the formula for the sum of interior angles of a polygon with...
Angles in parallel lines
This chapter explores angles in parallel lines. The objectives of this chapter are; to understand and be able to use alternate, supplementary and corresponding angles in parallel lines. What are parallel lines? Parallel lines...
Angle Proofs
This chapter explores understanding and proving angles. At the end of this chapter you should have good understanding and be able to prove that; ‘angles in a triangle add up to 180°‘, ‘angles in...
Angle Sums
This chapter explores Angle sums. It covers; angles on a line total 180°, angles around a point total 360° and angles in a triangle total 180°. Special angles You’ll need to know the following...
Angle Reasoning
This chapter explores angle reasoning. It covers using the symmetries of a square, an equilateral triangle and an isosceles triangle to work out triangles. No prior knowledge is required for this chapter. Folding a...
Angles of elevation and depression
This chapter explores angles of elevation and depression. It covers working with angles of elevation and depression and using scale drawing and trigonometry to calculate heights of tall objects. No prior knowledge is required...
Reflecting Shapes
This shape explores reflecting shapes. It covers reflecting shapes around a coordinate grid and describing reflections using mirror lines. No prior knowledge is required for this chapter. In this chapter you’ll explore how to...
Lines of Symmetry
This chapter explores lines of symmetry. It explores reflecting shapes, understanding reflective symmetry, and recognising shapes with reflective symmetry. No prior knowledge is required for this chapter. Most shapes in the world have a...