August 23, 2021
Do you still remember the formulae for calculating the area or volume of circle in IGCSE/GCSE Maths?
Circles
- Circle Area โถ ๐๐ยฒ
- Circumference โถ ๐๐ซ
- Semi - Circle Area โถ ๐๐ยฒ รท 2
- Semi - Circle Perimeter โถ (๐๐ซ รท 2) + ๐ซ
- Area of a sector โถ ๐น/360 x ๐๐ยฒ
- Length of an arc โถ ๐น/360 x ๐๐ซ
- Perimeter of Sector โถ ๐น/360 x ๐๐ซ + ๐ซ
Area
- Triangle Area โถ ๐รโรท2
- Trapezium Area โถ ยฝ(๐+๐) ร โ
- Parallelogram Area โถ ๐รโ
- Cuboid Volume โถ ๐ ร w ร โ
- Prism volume โถ area of cross section ร โ/length
- Cylinder volume โถ ๐๐ยฒโ = (area of cross section x height)
- Cylinder Surface area โถ ๐๐ซ x โ + 2(๐๐ยฒ) = Curved SA + area of 2 bases
- Curved SA of cylinder โถ ๐๐ซ x โ = circumference x height
- Pyramid volume โถ โ ๐รโ = โ (area of base x height)
- Cone Volume โถ โ ๐๐ยฒโ = โ (area of base x height)
- Cone Surface area โถ ๐๐๐ + (๐๐ยฒ/area of base) where ๐ = โrยฒ + hยฒ
- Perimeter โถ Circumference proportion + left over sides
- Sphere volume โถ 4/3๐๐ยณ
- Sphere SA โถ 4๐๐ยฒ
- Hemisphere โถ (4/3๐๐ยณ) รท2
- Hemisphere SA โถ 2๐๐ยฒ + base area
- Length x:y
- Area xยฒ:yยฒ
- Volume xยณ:yยณ
- Smaller surface/area = bigger pressure exerted as the force cannot spread.
That's the end of the topic!
Drafted by Bonnie (Mathematics)