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Volume of Prisms Flashcards
GCSE Mathematics (Edexcel) 1MA1
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Volume of a prism formula
Volume = Cross-sectional area × Length (or height).
Definition of a prism
A 3D shape with a constant cross-sectional area along its length.
Cross-sectional area
The area of the face that is repeated along the length of the prism.
Units for volume
Volume is measured in cubic units, e.g., cm³, m³.
Volume of a rectangular prism
Volume = Length × Width × Height.
Volume of a triangular prism
Volume = (1/2 × Base × Height of triangle) × Length of prism.
Volume of a cylinder
Volume = π × Radius² × Height.
Key step in finding volume
First calculate the cross-sectional area, then multiply by the length.
What is a cross-section?
A 2D shape that is the same along the entire length of the prism.
Common mistake in volume calculations
Forgetting to use the same units for all dimensions before calculating.
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