Area of Rectangles, Triangles and Parallelograms
Derive and apply formulae to calculate and solve problems involving perimeter and area of triangles and parallelograms (KS3)

Teaching for Understanding
Resources and ideas to promote understanding
Concrete and Pictorial
Area builder (PHeT)
Drag and drop squares to create compound shapes; could be used to model area basics or investigate perimeter and area.
Exploring area package (Illuminations)
Drag and drop squares to create compound shapes; could be used to model area basics or investigate perimeter and area.
Exploring area package (Illuminations)
 Interactive area tool: Interactive resource designed for pupils to discover the formulae for area of a triangle and parallelogram.
 Squares and rectangles sheet: Develop area of a triangle formula and a couple of practice problems.
 Rectangles and parallelograms sheet: Transform the rectangles into parallelograms.
 Shape cutter interactive: Useful for demonstrating transformation of a rectangle into a parallelogram and vice versa.
Fluency
Collections of standard practice problems in various formats
Worksheets
Worksheet from greatschools.org
Area of triangles collection (mathinenglish.com)
Where's the point? (KangarooMaths via SuffolkMaths)
Excellent worksheet requiring pupils to convert between metres, km, cm, mm and calculate resulting areas; also good for practising decimal multiplication in context and dealing with unit conversions.
 Sheet one: Area by counting squares
 Sheet two: Finding area of squares and rectangles by multiplying.
 Sheet three: Finding area using long multiplication strategies.
 Sheet four: Straightforward simple practice worksheet finding the area of rightangled triangles.
Area of triangles collection (mathinenglish.com)
 Area of triangles: Simple practice finding the area given base and height.
 Area within triangles: Finding shaded areas using the area of a triangle.
 Perimeter and area: Finding both measurements for triangles.
 Height of triangles: Working backwards to find the height given the area.
Where's the point? (KangarooMaths via SuffolkMaths)
Excellent worksheet requiring pupils to convert between metres, km, cm, mm and calculate resulting areas; also good for practising decimal multiplication in context and dealing with unit conversions.
WHiteboard Display
Coming soon.
Revision Resources
Enrichment, Extension and Problemsolving
Resources to extend thinking, enrich lessons or enhance problemsolving skills
Quick Puzzles and Investigations
Investigations from Median (Don Steward)
 Fraction that is a triangle: Good activity linking area of triangles and fractions.
 Triangles in a 5 by 5 square: Similar to above using 5 by 5 dotty grid.
 Dotty triangles: Which triangle covers the largest fraction of the rectangle?
 Area of parallelograms: Find the link between area, dots on the boundary and dots inside parallelograms with a fixed perimeter.
Other Links and Resources
Useful stuff that doesn't fit anywhere else
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