With this figure show work find the surface area

Just tell me how to set up the equation.

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

(05.02) mr. morris is going to save money and replace his sailboat's mainsail himself. he must determine the area of the mainsail in order to buy the correct amount of material. calculate the area of the parallelogram to determine how much material should be purchased. be sure to explain how to decompose this shape into rectangles and triangles. describe their dimensions and show your work.