Applications of definite integral

1103068001

Level: 
A
Which of the following formulas does NOT express the area of the yellow triangle indicated in the picture?
\( \int\limits_1^ 6(-0.8x+5.8)\,\mathrm{d}x \)
\( \frac12\cdot(5-1)\cdot(6-1)\cdot\sin90^{\circ} \)
\( \frac{4\cdot5}2 \)
\( \int\limits_1^ 6(-0.8x+5.8)\,\mathrm{d}x-5 \)