William cuts out a paper right trapezoid that is 10 cm high. When he folds his trapezoid, he sees that it makes a square and a right isosceles triangle. What is the area of the trapezoid and the formula?

step-by-step explanation:

i have done this all on a piece of paper but idk how to put it on here cuz it needs to be drawn

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.