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Year 9 · Maths

Solve Right Angled Triangle Problems

Year 9 learners practise pythagoras theorem and right angled triangle trigonometry.

The activities include Calculate Side Lengths on a Triangle Using Trigonometry, Calculate the Missing Sides of a Triangle Using Pythagoras' Theorem, Find Side Lengths and Angles in Right-angled Triangles, and related practice. The checked support below includes video, worksheet, teaching, lesson. Open a resource in its provider's website and choose the format that best helps the learner explain the idea independently.

Activities covered

  • Calculate Side Lengths on a Triangle Using Trigonometry
  • Calculate the Missing Sides of a Triangle Using Pythagoras' Theorem
  • Find Side Lengths and Angles in Right-angled Triangles
  • Find Side Lengths on a Triangle Using Trigonometry
  • Find the Angle Using Trigonometry
  • Identify Right-Angled Triangles
  • Identify the Sides of a Right-Angled Triangle
  • Identify Trigonometric Ratios in Right-Angled Triangles
  • Recognise the Correct Trigonometric Ratio
  • Understand Pythagoras Theorem
  • Use Pythagoras Theorem

Checked learning resources

  • Choosing an appropriate method for finding lengths of a triangle

    Oak National Academy · Video · Opens on the provider website

    I can choose the appropriate method to find the missing side in a right-angled triangle. This KS3 maths video lesson directly teaches the concepts and calculation method required by "Calculate Side Lengths on a Triangle

  • Problem solving with similarity and Pythagoras' theorem

    Oak National Academy · Video · Opens on the provider website

    I can use my knowledge of similarity and Pythagoras' theorem to solve problems. This KS3 maths video lesson directly teaches the concepts and calculation method required by "Calculate the Missing Sides of a Triangle Usin

  • Checking and securing understanding of Pythagoras' theorem

    Oak National Academy · Video · Opens on the provider website

    I can use Pythagoras' theorem to find the length of any side of a right-angled triangle. This KS3 maths video lesson directly teaches the concepts and calculation method required by "Identify Right-Angled Triangles".

  • Determining which side

    Oak National Academy · Video · Opens on the provider website

    I can identify which side length is missing and use the appropriate form of Pythagoras' theorem to calculate it. This KS3 maths video lesson directly teaches the concepts and calculation method required by "Identify the

  • Choosing the right trigonometric ratio

    Oak National Academy · Video · Opens on the provider website

    I can choose the appropriate trigonometric ratio to use to solve problems in right-angled triangles. This KS3 maths video lesson directly teaches the concepts and calculation method required by "Identify Trigonometric Ra

  • Demonstrating Pythagoras' theorem

    Oak National Academy · Video · Opens on the provider website

    I can appreciate there is a relationship between the lengths of the sides of a right-angled triangle. This KS3 maths video lesson directly teaches the concepts and calculation method required by "Understand Pythagoras Th

  • Pythagoras' theorem in context

    Oak National Academy · Video · Opens on the provider website

    I can use and apply Pythagoras' theorem to solve problems in a range of contexts. This KS3 maths video lesson directly teaches the concepts and calculation method required by "Use Pythagoras Theorem".

  • Pythagoras and trigonometry

    BBC Bitesize · Worksheet · Opens on the provider website

    BBC KS3 maths teaching, worked examples and practice checks for Solve Right Angled Triangle Problems, including calculation. This was selected against the complete context of "Calculate Side Lengths on a Triangle Using T