Planes of Symmetry Flashcards
All 5 cards in this deck
What is a plane of symmetry of a 3D solid?
A flat surface that cuts the solid into two halves, each one a mirror image of the other.
How many planes of symmetry does a cube have?
— parallel to pairs of faces and through pairs of opposite edges.
How many planes of symmetry does a cuboid with three different edge lengths have?
— one halfway through each pair of opposite faces.
How many planes of symmetry does a cylinder have?
Infinitely many — every vertical plane through its axis, plus the horizontal plane halfway up.
True or false? A prism whose cross-section is an equilateral triangle has planes of symmetry.
True. Three planes along the length (one through each vertex of the triangle) and one halfway along the length.