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Area, SMB-029 MC

The plan of a square area of land is drawn below.

A mining licence is granted over part of the land.

All measurements are given in kilometres.
 

The area of land the mining licence covers is

  1. `x^2-20`
  2. `x^2 + 20`
  3. `2x^2-9`
  4. `2x^2-20`
Show Answers Only

`A`

Show Worked Solution

`text{Area of original land}\ = x xx x = x^2\ text{km}^2`

`text{Size of non-mining area}\ = 4 xx 5 = 20\ text{km}^2`

`:.\ text(Area of mining)\ = (x^2-20)\ text{km}^2`

`=>A`