First you want to divide the triangle into 7 equal triangles.
Since the height of each of these 7 triangles divides each of them in half we get 14 trangles with height of 27 and base of 13 (this is because the original side is divided into two halves: 26/2=13.)
To find the area of one of the triangles we will use the formula:
[tex]( \frac{1}{2} )b \times h[/tex]
where b is the base and h is the height.
Plugging in the values that we have into the formula, we get
[tex]( \frac{1}{2} ) 13 \times 27[/tex]
which gives us 175.5
Since there are 14 of these triangles in total, we must multiply this number by 14 so we get
[tex]175.5 \times 14[/tex]
which ends up with our answer: 2457mm
Choice C is your answer.
