Know when to use Pythagoras or Trigonometry to solve problems

Know when to use Pythagoras or Trigonometry to solve problems

Lesson details

Key learning points

  1. In this lesson, we will recognise when it is appropriate to use Pythagoras or Trigonometry when finding missing lengths and angles in right angle triangles.

Licence

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3 Questions

Q1.
Correct answer: Diagram A
Diagram B
Others
Q2.
A ship sales 15 km on a bearing of 060° from a point P. How far East of its original position is it? Give your answer to 2 decimal places.
Correct answer: 12.99 km
25.98 km
7.5 km
Others
Q3.
A plane flies 100 km due east from point A to reach point B. It then flies 30 km due south to reach point C. What bearing is C from A?
017 degrees
073 degrees
Correct answer: 107 degrees
Others

3 Questions

Q1.
Would you use Pythagoras or Trigonometry to work out x?
Both
Neither
Others
Pythagoras
Correct answer: Trigonometry
Q2.
Find 𝑥 in the triangle. Give your answer to one decimal places.
Correct answer: 12.1 cm
12.1 degrees
15.7 cm
15.7 degrees
Others
Q3.
Which of these could you use to work out x?
Neither Pythagoras or Trigonometry
Others
Pythagoras
Correct answer: Pythagoras or Trigonometry
Trigonometry

Lesson appears in

UnitMaths / Trigonometry 3