Combining Loci: Error Analysis & Misconceptions

Mathematics
GCSE Foundation
13 questions
~26 mins
1 views0 downloads

About This Worksheet

A worksheet exploring common errors and misconceptions when combining loci, aimed at GCSE Foundation students.

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Combining Loci: Error Analysis & Misconceptions

Subject: MathematicsGrade: GCSE Foundation
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Untitled Worksheet

Grade GCSE Foundation
A

Fluency & Practice

Answer all questions. Show your working in the grid spaces provided.
1.
Construct the locus of points equidistant from points A and B, where A is at (2, 3) and B is at (6, 7).
[3 marks]
2.
Plot the locus of points that are 4 units from the point (5, 5).
[2 marks]
3.
Construct the locus of points equidistant from a line and a point not on the line.
[3 marks]
4.
Plot the locus of points that are 3 units from the line y=2.
[2 marks]
B

Problem Solving & Reasoning

Work through the multi-step problems carefully.
1.
A point P moves such that it is always equidistant from points A(1, 2) and B(5, 6). A student claims the locus is a circle. Explain whether this is correct and justify your answer.
[4 marks]
2.
Construct the locus of points that are both 5 units from point C(4, 4) and 3 units from line y=1. Describe the shape of this locus.
[4 marks]
3.
Explain how the locus of points equidistant from two intersecting lines is constructed.
[3 marks]
C

Real-world Applications

Solve the following contextual problems.
1.
A surveyor is marking out a region that is exactly 10 meters from a river represented by the line y=0. If they want to mark a point 15 meters from a village at (8, 12), how should they proceed?
[4 marks]
2.
A drone needs to fly such that it remains equidistant from two landmarks at (3, 4) and (7, 8). Describe the path it should follow.
[3 marks]
D

Challenge & Extension

Attempt these challenging problems for extension.
1.
Construct the locus of points that are simultaneously 5 units from circle A with radius 3 and 7 units from circle B with radius 4, where the circles intersect. Describe the shape formed.
[4 marks]
2.
Given two lines that intersect at (2, 3), construct the locus of points equidistant from both lines. Explain any special features of this locus.
[4 marks]
E

Mixed Review & Error Analysis

Review the questions carefully. Identify and correct the common misconceptions.
1.
A student claims that the locus of points equidistant from two parallel lines is a single point. Is this correct? Explain and correct the misconception.
[3 marks]
2.
Identify the mistake in this reasoning: 'The locus of points 4 units from a circle is another circle with radius 4.'
[3 marks]

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Details

Created
1/1/2026
Updated
1/1/2026
Type
worksheet