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Order the steps for the area of a triangle

Exercise and reference answers

Steps
  1. Write the three vertices as the rows of a 3 × 3 determinant
  2. Fill the third column entirely with 1s
  3. Expand the determinant
  4. Multiply the result by one half
  5. Take the modulus, since an area is never negative

Explanation

The method your syllabus uses: place the coordinates in rows, pad the last column with 1s, expand, halve, and take the modulus because area cannot be negative. Source: syllabus Maths Part I, Ch 4 Determinants.
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