The cards Question What is a polygon? Tap to flip Answer A flat (2D), closed figure made up of straight line segments. Question What is a regular polygon? Tap to flip Answer A polygon whose sides are all equal and whose interior angles are all equal. Question What is an irregular polygon? Tap to flip Answer A polygon whose sides are not equal or whose interior angles are not equal. Question How many sides does a quadrilateral have? Tap to flip Answer 4 Question When are two lines parallel? Tap to flip Answer When they are straight lines that are always the same (non-zero) distance apart. Question What is the correct mathematical name for the shape often called a diamond? Tap to flip Answer Rhombus. Question What is a parallelogram? Tap to flip Answer A quadrilateral with two pairs of parallel and equal sides. Question What is area? Tap to flip Answer The size of a surface: the number of unit squares needed to cover it completely. Question What is perimeter? Tap to flip Answer The distance around a 2D shape. Question Can different rectangles have the same perimeter? Tap to flip Answer Yes. Question The area of a parallelogram can be deduced from the area of which shape? Tap to flip Answer A rectangle. Question How can the perimeter of any polygon be found? Tap to flip Answer By adding its side lengths (though this may be time consuming). Question If the perimeter of a polygon is known, what can be found? Tap to flip Answer Missing side lengths. Question What is a compound shape? Tap to flip Answer A shape created using two or more basic shapes. Question What is another term for a compound shape? Tap to flip Answer A composite shape. Question What is a composite rectilinear shape? Tap to flip Answer A composite shape made from rectangles. Question When does doubling the length and width give the perimeter of a composite rectilinear shape? Tap to flip Answer Only if the lengths do not overlap. Question In a triangle, what is the base? Tap to flip Answer The side which is perpendicular to the height. Question What is the perpendicular height of a triangle? Tap to flip Answer The perpendicular distance from the base to the opposite vertex. Question How does the area of a triangle compare with the parallelogram formed by two of those triangles? Tap to flip Answer It is half the area of that parallelogram. Question What is the formula for the area of a triangle? Tap to flip Answer 0.5 × base × perpendicular height Question For the area of a triangle, how must the base and height be related? Tap to flip Answer They must be perpendicular (at a right angle) to each other. Question If the area of a triangle is known, what can be found? Tap to flip Answer Missing sides. Question Give one method for finding the area of a composite rectilinear shape. Tap to flip Answer e.g. break it into rectangles, complete the shape, or rearrange the shape. Question Is breaking a composite shape into rectangles always the best approach to its area? Tap to flip Answer No. There is not always enough information for that method, so flexible thinking is needed. Question For two sets of side lengths in a rectilinear shape to be equal, what must be true? Tap to flip Answer One set must be parallel to the other and none of the lengths can overlap. Question What is the plural of trapezium? Tap to flip Answer Trapezia or trapeziums. Question What is a trapezium? Tap to flip Answer A quadrilateral with exactly one pair of parallel opposite sides. Question How does the area of a trapezium compare with the parallelogram formed from two identical trapeziums? Tap to flip Answer It is half the area of that parallelogram. Question Can the trapezium area formula be used to find one of its slanted sides? Tap to flip Answer No. Question In a perimeter or area problem, what should be true of the units of measurement? Tap to flip Answer They should be the same. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage Key stage 3 (Years 7–9) Course KS3 Maths Unit Perimeter and area 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: 12 · primary: 12 · second publisher: 0
Show the other sources (10) Primary source Calculating missing side lengths from the area of a trapezium (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Problem solving with perimeter and area (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Securing understanding of perimeter and area (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Finding the perimeter of polygons (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Calculating missing lengths with perimeter of polygons (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Perimeter with composite rectilinear shapes (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Area of a triangle (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Using the formula for the area of a triangle (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Area of composite rectilinear shapes (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Calculating missing side lengths from the area of composite rectilinear shapes (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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