The first picture: 9*(9-3)=54 square centimeters. We can move the square at the bottom to the top by digging and filling, and then find the long area, which is 9-3, multiplied by the height.

The second picture: S ladder =(A+B)*H/2

=(6+9)*8/2

= 15*8/2

= 120/2

=60 square centimeters

8-3=5 cm

(6+5)*3/2= 16.5

60- 16.5=43.5

We can regard this figure as a trapezoid. Knowing the upper bottom, the lower bottom and the height, we can use (6+9)*8/2, which is a small trapezoid. We are trying to find its bottom, which is 8-3, and then we can find the area of a small trapezoid, and we can find the small area with a large area, which is his area.

It's genuine, not copied. I repeat what the teacher said, I hope you can understand! ! I wish you progress in your study! !