#### 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

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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