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In differential geometry, the first fundamental form is the inner product on the tangent space of a surface in three-dimensional Euclidean space which is induced canonically from the dot product of R3. It permits the calculation of curvature and metric properties of a surface such as length and area in a manner consistent with the ambient space. The first fundamental form is denoted by the Roman numeral I, Let X(u, v) be a parametric surface. Then the inner product of two tangent vectors is where E, F, and G are the coefficients of the first fundamental form.

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• First fundamental form
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• In differential geometry, the first fundamental form is the inner product on the tangent space of a surface in three-dimensional Euclidean space which is induced canonically from the dot product of R3. It permits the calculation of curvature and metric properties of a surface such as length and area in a manner consistent with the ambient space. The first fundamental form is denoted by the Roman numeral I, Let X(u, v) be a parametric surface. Then the inner product of two tangent vectors is where E, F, and G are the coefficients of the first fundamental form.
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• In differential geometry, the first fundamental form is the inner product on the tangent space of a surface in three-dimensional Euclidean space which is induced canonically from the dot product of R3. It permits the calculation of curvature and metric properties of a surface such as length and area in a manner consistent with the ambient space. The first fundamental form is denoted by the Roman numeral I, Let X(u, v) be a parametric surface. Then the inner product of two tangent vectors is where E, F, and G are the coefficients of the first fundamental form. The first fundamental form may be represented as a symmetric matrix.
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