Exam-style question
Try this first
What should a student check when answering a question on the coordinate geometry of the circle including the equation…?.
- A.C2: connect the result back to the original question
- B.Use any familiar GCSE calculation even if it ignores the coordinate geometry of the circle including the equation…
- C.Write only the final answer without showing the mathematical method
- D.Change the notation or restrictions to make the algebra look simpler
Model answer
What a good answer should say
- The correct answer is C2: connect the result back to the original question.
- This option is best because use radians, exact values, identities or interval restrictions as the question requires, then checks that the notation, restrictions and conclusion match the AQA A-level Mathematics objective.
This answer is tied to the objective: C2 Understand and use the coordinate geometry of the circle including the equation of a circle in the form (x - a)^2 + (y - b)^2 = r^2; complete the square to find the centre and radius; use circle properties including the angle in a semicircle, the perpendicular from the centre to a chord, and the radius perpendicular to a tangent..
Explanation
Why this works
Use the explanation to connect the worked answer back to C2 Understand and use the coordinate geometry of the circle including the equation of a circle in the form (x - a)^2 + (y - b)^2 = r^2; complete the square to find the centre and radius; use circle properties including the angle in a semicircle, the perpendicular from the centre to a chord, and the radius perpendicular to a tangent..
C2: connect the result back to the original question is the correct option. It directly supports the coordinate geometry of the circle including the equation… by requiring the student to use radians, exact values, identities or interval restrictions as the question requires.
The other options are weaker because they hide the reasoning, ignore restrictions, or use a generic calculation that may not fit the objective.
Maths method check
- Topic focus: Pure Mathematics.
- Question style: practice.
- Reasoning demand: analysis.
- Check the operation, notation, units, and final answer form against the question before moving on.
Common mistake
No common mistake is linked to this question yet.