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GCSE Mathematics · key term
The complete outside boundary of a 3D shape; it may contain flat and curved parts.
Used by AQA, Edexcel and OCR
Specification G12 · Paper 1, Paper 2, Paper 3
Revise: 3D ShapesThe complete outside boundary of a solid is its surface. A flat part of this surface is called a face, and every face is itself a 2D shape. For example, a cube has square faces and a cylinder has circular faces.
Specification G12 · Paper 1, Paper 2, Paper 3
A flat or curved part of the outside of a 3D shape.
State whether a surface is flat or curved. Under the convention used here, the circular boundaries of cones and cylinders are not counted as edges because they are not straight line segments where two flat faces meet.
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When describing a solid, look at its outside and separate three kinds of feature: flat faces, curved surfaces and the places where flat faces meet.
Specification 8.01d · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
The outside boundary of a solid; it may include flat and curved parts.
Revise: Solid TerminologySome solids have only flat surfaces. These are called polyhedra: their faces are polygons, such as squares, rectangles or triangles. Other solids have curved surfaces.