IGCSE›Cambridge IGCSE Maths›Mind mapsArea & PerimeterCambridge IGCSE Maths: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsPerimeterTotal distance around the outsideRectangle: P=2l+2wP = 2l + 2wP=2l+2wWork out any missing sides firstArea formulasRectangle: A=lwA = lwA=lwTriangle: A=12bhA = \frac{1}{2}bhA=21bh (given in exam)Parallelogram: A=bhA = bhA=bhTrapezium: A=12(a+b)hA = \frac{1}{2}(a+b)hA=21(a+b)hCompound shapesSplit into simple shapesFind missing lengths by adding or subtractingAdd the areas togetherPerimeter counts outer edges onlyArea & perimeter2D shapescm²m²mm²Unit conversionArea converts using the square of the factor1 m2=10 000 cm21\,\text{m}^2 = 10\,000\,\text{cm}^21m2=10000cm21 cm2=100 mm21\,\text{cm}^2 = 100\,\text{mm}^21cm2=100mm21 km2=1 000 000 m21\,\text{km}^2 = 1\,000\,000\,\text{m}^21km2=1000000m2Worked exampleTrapezium: sides 6 cm and 10 cm, height 4 cmA=12(6+10)×4A = \frac{1}{2}(6+10) \times 4A=21(6+10)×4Answer: 32 cm²Exam tipsHeight must be perpendicular to the baseLabel every side you calculateNot squaring the factor is the top conversion errorOnly the triangle formula is given