Perimeter, area and volume · Usually met around P5
Areas of parallelograms, triangles and trapeziums
From “Heights of triangles and quadrilaterals” to “Areas of polygons”, step by step, each skill with its methods, worked examples and answers.
Skills in this topic, easy to hard
- Heights of triangles and quadrilateralsSquare to the base, from the base to the opposite corner
- Area of a parallelogramBase × height: the slanting side isn't the height
- Area of a triangleBase × height ÷ 2: halve the even one first
- Area of a trapezium(top + bottom) × height ÷ 2
- Areas of triangles, parallelograms and trapeziums togetherBase × height; a triangle's is half that
- From an area back to a base or heightTriangle: height = area × 2 ÷ base
- Areas of polygonsCut up and add, or fill in and subtract
Practise it in the game →Areas of parallelograms, triangles and trapeziums · Free to start, unlimited questions, no downloadAll maths topics →