1. The problem is to find the area of plane shapes. 2. The formula for the area depends on the shape. For example, for a rectangle, the area $A$ is given by: $$A = \text{length} \times \text{width}$$ 3. For a triangle, the area $A$ is: $$A = \frac{1}{2} \times \text{base} \times \text{height}$$ 4. For a circle, the area $A$ is: $$A = \pi \times r^2$$ where $r$ is the radius. 5. To find the area, identify the shape, measure the required dimensions, and apply the corresponding formula. 6. Always ensure units are consistent and the result is in square units. 7. If you provide a specific shape and dimensions, I can calculate the exact area for you.