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Tap every matrix that must be square

Exercise and reference answers

Questions
  1. Items
    1. Text
      Diagonal matrix
      Matches the category
      Yes
    2. Text
      Scalar matrix
      Matches the category
      Yes
    3. Text
      Identity matrix
      Matches the category
      Yes
    4. Text
      Row matrix
      Matches the category
      No
    5. Text
      Zero matrix
      Matches the category
      No
    Category
    Must be a square matrix
  2. Items
    1. Text
      A′ = −A
      Matches the category
      Yes
    2. Text
      It is a square matrix
      Matches the category
      Yes
    3. Text
      A′ = A
      Matches the category
      No
    4. Text
      Every entry is zero
      Matches the category
      No
    Category
    True of a SKEW symmetric matrix

Explanation

Diagonal, scalar and identity matrices are all special square matrices a zero matrix need not be. Source: syllabus Maths Part I, Ch 3 Matrices.
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