Since we are given the isosceles right angled triangle, the base = height(which is 5 inches)
We have been given the rectangle to have a base DE = t inches, which makes the area
of the rectangle as 5t inches.
Also, the area of the triangle will be \(\frac{1}{2}*5*5 = 12.5\)
The area of the trapezoid will be 5t + 12.5 square inches(Option A)