Mensuration (Area)
Question
Surface Area
Shape | Formula |
Square | l x w |
Rectangle | l x w |
Triangle | 1/2 x b x h |
Parallelogram | b x h |
Trapezium | 1/2 x (Base Length + Top Length) x h |
Circle | Πr 2 |
l = Length
w = Width
b = Base
h = Height
r = radius
Other surface areas
Shape | Formula | Description |
Cube | 6 x Length x Width | A cube is made up of of six square surfaces with same area. |
Cuboid | (2 x Height x Width) + (2 x Height x Base) + (2 x Base x Width) | Each pair of triangles have same area, total three pairs. |
Cylinder (solid) | 2Πr 2 + 2Πr x height of the cyclinder | |
Cone (solid) | Πr 2 + Πrl | l refers to slant height |
Sphere | 4Πr 2 |
r = radius
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