The width of the KNMT rectangle is 26 cm, and its length is 14 cm greater. What is the area of the KNMT rectangle?

The width of the KNMT rectangle is 26 cm, and its length is 14 cm greater. What is the area of the KNMT rectangle? What is the area of each of the rectangles into which the segment KM splits this rectangle?

given
rectangle
width = 26 cm
length 14 cm more than width

solution
1) we find the length of the rectangle, for this we add the width of the rectangle by the difference with the length of the rectangle, that is, 26 cm + 14 cm = 40 cm the length of the rectangle
2) area = length * width = 40 * 26 = 40 * 20 + 40 * 6 cm squared = 800 + 240 cm squared = 1040 cm squared
3) the segment KM divides the rectangle diagonally into two equal triangles, then
the area of each triangle is 1040: 2 = 520 cm squared