IGCSE Maths / Transformation and similarity

Enlarging from a given centre

Edexcel International GCSE Maths (4MA1), chapter 14: Transformation and similarity, specification point 5.2l. Part of the full course.

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An enlargement changes a shape’s size while keeping each image corner on a straight line from the centre of enlargement. To place the image correctly, count from the given centre to each corner and multiply both coordinate changes by the scale factor.

More lessons in Transformation and similarity

• Lines of symmetry and rotational symmetry
• Equations of common mirror lines
• Reflecting a shape in a line
• Reflecting in y = x and y = -x
• Finding the mirror line from object and image
• What defines a rotation
• Rotating a shape about a point
• Positive and negative rotation angles
• Rotating about a point not on the shape
• What defines a translation
• Translating a shape
• Column vectors in translations
• Congruence under transformations
• Describing a single transformation fully
• Combining two transformations
• What defines an enlargement
• Similarity under enlargement
• Fractional scale factor enlargements
• Finding the centre of enlargement
• Conditions for congruent triangles
• Proving triangles are congruent
• Similar shapes: corresponding lengths
• Area scale factor
• Volume scale factor
• Similar solids, mass and capacity
• Similar shapes problem solving