The cards Question What is the perimeter of a 2D shape? Tap to flip Answer The distance around the shape. Question What is a polygon? Tap to flip Answer A flat (2D), closed figure made up of straight line segments. Question What is a compound (composite) shape? Tap to flip Answer A shape created using two or more basic shapes. Question How can the perimeter of any polygon be found? Tap to flip Answer By adding up the lengths of its sides. Question What does the area of a surface state? Tap to flip Answer The number of unit squares needed to completely cover that surface. Question What is a trapezium? Tap to flip Answer A quadrilateral with exactly one pair of parallel opposite sides. Question Give one plural form of 'trapezium'. Tap to flip Answer Trapezia or trapeziums (either is accepted). Question What is a composite rectilinear shape? Tap to flip Answer A composite shape made from rectangles. Question When finding area, which lengths are multiplied together to make square units? Tap to flip Answer Lengths that are perpendicular to each other. Question How can the area of a composite shape be found? Tap to flip Answer By splitting it into shapes whose areas can be found. Question What is the diameter of a circle? Tap to flip Answer Any line segment that starts and ends on the edge of the circle and passes through the centre. Question What is the radius of a circle? Tap to flip Answer Any line segment that joins the centre of the circle to its edge. Question What is the circumference of a circle? Tap to flip Answer The perimeter of the circle. Question What is the name of the constant ratio between a circle's diameter and its circumference? Tap to flip Answer π (pi). Question Is π a rational or an irrational number? Tap to flip Answer Irrational. Question What is the formula for the circumference of a circle using the diameter d? Tap to flip Answer C = πd Question What is the formula for the circumference of a circle using the radius r? Tap to flip Answer C = 2πr Question Is π a variable or a constant? Tap to flip Answer A constant: it is the same for every circle. Question How must an answer be written for it to be exact when it involves π? Tap to flip Answer Left in terms of π. Question When an answer is written in terms of π, is π the unit? Tap to flip Answer No. π is part of the number; units still need to be stated. Question A circle cut into congruent sectors can be rearranged into which shape to derive its area? Tap to flip Answer A parallelogram. Question When a circle is rearranged into a parallelogram, what is the parallelogram's length? Tap to flip Answer Half the circumference of the circle. Question When a circle is rearranged into a parallelogram, what is the parallelogram's height? Tap to flip Answer The radius of the circle. Question What is a sector of a circle? Tap to flip Answer The region formed between two radii and their connecting arc. Question To find the area of a quarter-circle, what do you divide by 4? Tap to flip Answer The area of the whole circle, not the radius. Question What is an arc of a circle? Tap to flip Answer Part of the circle's circumference. Question Do shapes with the same area always have the same perimeter? Tap to flip Answer No. Rearranging parts does not change the area but may change the perimeter. Question To find the radius of a semicircle from its area, what do you do to the area first? Tap to flip Answer Double it, to get the area of the full circle. Question Once you have a full circle's area, how do you find its radius? Tap to flip Answer Divide by π, then take the square root. Question What is surface area? Tap to flip Answer The total area of all the surfaces of a closed 3D shape, including all faces and any curved surfaces. Question What is the net of a 3D object? Tap to flip Answer A 2D representation of its surfaces that can be folded up into the 3D object. Question Does every arrangement of 6 squares make the net of a cube? Tap to flip Answer No. Some arrangements overlap when folded, giving an incomplete cube. Question What is a prism? Tap to flip Answer A polyhedron with a polygon base and an identical, parallel opposite face. Question What is a cross-section of a 3D object? Tap to flip Answer A 2D face made by cutting straight through any plane of the object. Question What is often used to name a prism? Tap to flip Answer The polygon of its cross-section. Question What shape are the sides that connect the two bases of a prism? Tap to flip Answer Parallelograms. Question Besides congruent end faces, what must be true for a 3D shape to be a prism? Tap to flip Answer The cross-section must be the same throughout, and the two end faces must be parallel. Question What are the faces of a 3D shape? Tap to flip Answer Its flat 2D surfaces. Question What is volume? Tap to flip Answer The amount of space occupied by a closed 3D shape. Question How do you find the volume of a prism? Tap to flip Answer Multiply the area of the cross-section by the length. Question What is a cylinder? Tap to flip Answer A 3D shape with a circular base and an identical, parallel opposite face; cross-sections parallel to the base are uniform. Question Is a cylinder a prism? Tap to flip Answer No, but it has a similar structure. Question Which formula can be used to derive the volume of a cylinder? Tap to flip Answer The formula for the volume of a prism. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage Key stage 3 (Years 7–9) Course KS3 Maths Unit Perimeter, area and volume England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-03, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
Sources Total: 14 · primary: 14 · second publisher: 0
Show the other sources (12) Primary source Surface area of prisms (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Volume of prisms (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Surface area of cylinders (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Volume of cylinders (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Checking understanding of area (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Multiplicative relationships in circles (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Circumference of a circle (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Area of a circle (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Area of composite shapes (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Perimeter of composite shapes (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Finding a length in composite shapes (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Surface area of cuboids (opens in a new tab) (Oak National Academy, thenational.academy) Found a mistake? Write to support@flashfeed.app .
A Maths lesson by Oak National Academy licensed under Open Government Licence (OGL)
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