Multiple Choice Question (MCQ)

The three sides of a triangle are 5m, 6m and 7m respectively. Which one below is the area of the triangle?

  1. ×

    15 m^2

  2. 6 \sqrt{6} m^2

  3. ×

    21 m^2

  4. ×

    9 m^2

Collected in the board: Triangle

Steven Zheng posted 1 year ago


Answer

  1. According to Helen's formula, the area of a triangle is


    A = \sqrt{p(p-a)(p-b)(p-c)} ,


    in which a, b, c is the length of three sides of the triangle,


    p = \dfrac{1}{2} (a+b+c)


    \therefore A = \sqrt{9×4×3×2 } = 6 \sqrt{6}

Steven Zheng posted 1 year ago

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