The cards Question What are supplementary angles? Tap to flip Answer A pair of angles that sum to 180°. Question What are conjugate angles? Tap to flip Answer A pair of angles that sum to 360°. Question Must two supplementary angles lie together on a straight line? Tap to flip Answer No. They only need to sum to 180°. Question What are vertically opposite (vertical) angles? Tap to flip Answer Pairs of opposite angles formed when two lines intersect at a point; they are equal. Question What is a vertex? Tap to flip Answer The point where two or more line segments meet. Question What is the plural of 'vertex'? Tap to flip Answer Vertices. Question When do angles on a straight line sum to 180°? Tap to flip Answer Only when all of those angles share a common vertex. Question What are the properties of an equilateral triangle? Tap to flip Answer Three equal angles and three edges of equal length; it is a regular triangle. Question What are the properties of a scalene triangle? Tap to flip Answer Three different-sized angles and three different-sized sides. Question What are the properties of an isosceles triangle? Tap to flip Answer Two equal angles and two sides of the same length. Question How many 90° interior angles does a right-angled triangle have? Tap to flip Answer Exactly one. Question A right-angled triangle can also be which two other types of triangle? Tap to flip Answer Scalene or isosceles. Question Is the base of an isosceles triangle always its horizontal side? Tap to flip Answer No. The base can have any orientation; check hash marks, angle markers or measurements. Question In maths, what is a line? Tap to flip Answer A straight 1D figure with no thickness that extends forever in both directions. Question What is a ray? Tap to flip Answer Part of a line with a fixed starting point that extends forever in one direction. Question What is a line segment? Tap to flip Answer Part of a line with a fixed start point and a distinct fixed end point. Question What is a transversal? Tap to flip Answer Any line that intersects two or more lines at distinct points. Question What are corresponding angles? Tap to flip Answer A pair of angles at different vertices on the same side of a transversal, in equivalent positions. Question When are corresponding angles equal? Tap to flip Answer When the lines cut by the transversal are parallel. Question Must a transversal intersect parallel lines? Tap to flip Answer No. It can intersect any set of lines or line segments, parallel or not. Question What are alternate angles? Tap to flip Answer A pair of angles, both between or both outside two line segments, on opposite sides of the transversal that cuts them. Question When are alternate angles equal? Tap to flip Answer When the two lines cut by the transversal are parallel. Question Where are co-interior angles? Tap to flip Answer On the same side of the transversal and in between the two other lines. Question If the two lines are parallel, how are co-interior angles related? Tap to flip Answer They are supplementary. 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 do the interior angles of any triangle sum to? Tap to flip Answer 180° Question Which angle facts can be used to prove the angle sum of a triangle? Tap to flip Answer Angles in parallel lines. Question What is an interior angle? Tap to flip Answer An angle formed inside a polygon by two of its edges. Question Can you assume a triangle's type from how it looks? Tap to flip Answer No, not unless there is notation or the type is stated. Question Into which shapes can any polygon be split to find its interior angle sum? Tap to flip Answer Triangles. Question When splitting a polygon into triangles, how do you stop the line segments crossing inside it? Tap to flip Answer Use a single common vertex for all the triangles. Question If the lines you draw create new vertices, do their angles count towards the original polygon's interior angle sum? Tap to flip Answer No. Question What is an exterior angle of a polygon? Tap to flip Answer An angle outside the polygon between an extension of an edge and its adjacent edge. Question Is the exterior angle the whole reflex angle outside a vertex? Tap to flip Answer No. It is the angle you turn through at the vertex when tracing round the shape. 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 How do the exterior angles of a regular polygon compare? Tap to flip Answer They are all equal. Question From what can the number of sides of a regular polygon be found? Tap to flip Answer The size of its interior or exterior angle. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage Key stage 3 (Years 7–9) Course KS3 Maths Unit Geometrical properties: polygons 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 Interior angles of a polygon (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Deriving the sum of interior angles in multiple ways (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Exterior angles of polygons (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Interior and exterior angles of regular polygons (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Securing understanding of angles from KS2 (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Formalising understanding of triangles from KS2 (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Formal angle notation (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Corresponding angles (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Alternate angles (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Co-interior angles (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Angles on parallel lines traversed by a straight line (opens in a new tab) (Oak National Academy, thenational.academy) Primary source The sum of the interior angles of any triangle (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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