Exact trig values
Edexcel GCSE Maths revision on Exact trig values. Aligned to the Pearson Edexcel GCSE Mathematics 1MA1 specification. This bank has 16 practice questions on this topic.
Sample questions (3 of 16)
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Question 1
What is the exact value of sin(30 degrees)?
- A) One half precisely
- B) Root two over two
- C) Root three over two
- D) One over root three
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Answer: One half precisely
The correct answer is one half. Students often confuse sin(30) with sin(60), which is root three over two.
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Question 2
What is the exact value of tan(45 degrees)?
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Answer: 1
The tangent of 45 degrees is 1 because the opposite side and adjacent side are equal in an isosceles right triangle. This is a fundamental exact value often used to solve coordinate geometry problems.
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Question 3
Which expression represents the exact value of cos(60 degrees)?
- A) Value 0.50
- B) Value 0.71
- C) Value 0.87
- D) Value 1.00
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Answer: Value 0.50
Since cos(60 degrees) is equal to sin(30 degrees), the value is 0.50. Distractors represent other common trigonometric values like root two over two or root three over two.
Want to test yourself on the remaining cards for this topic?
13 more questions on Exact trig values — plus mistakes tracking and spaced repetition across the whole Maths spec.