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A locus is a set of permitted positions - Paper 1
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
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Coordinate model: A=(0,0), B=(10,0), units centimetres. Find all points P exactly 4 cm from A AND equally distant from A and B. The first condition is a circle; the second is the perpendicular bisector x=5. Count intersections, including a tangent once. Exactly a distance describes the boundary, not a filled disc.
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