Math problem in the third grade of primary school: Find the perimeter and area of the following shapes.
1 perimeter of the graph: (12 8)×2=40 cm. You can't calculate the area without giving figures. 2 The perimeter of the figure is (30 20)×2 8×2= 1 16 decimeter, and the area is 30×20- 12×8=504 square decimeter. If the first figure is sent again, the missing place has no side length and the area cannot be calculated.