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# Mensuration (Area)

## Surface Area

 Shape Formula Square Length x Width Rectangle Length x Width Triangle 1/2 x Base x Height Parallelogram Base x Height Trapezium 1/2 x (Base Length + Top Length) x Height Circle Πr 2

## Other surface areas

 Shape Formula Description Cube 6 x Length x Width It consists of six square surfaces with same area. Cuboid (2 x Height x Width) + (2 x Height x Base) + (2 x Base x Width) Three pairs of rectangle where each pair of triangles have same area. Cylinder (solid) 2Πr 2 + 2Πr x height of the cyclinder Cone (solid) Πr 2 + Πrl l is the slant height Sphere 4Πr 2

### Mensuration – Area (Questions)

1. How long is the side of a cube if the surface area is 600cm2?
2. What is the surface area of a sphere if the radius is 0.7cm?

1. 10cm
2. 6.16cm2

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