Draw a hill with a height of 21 m with the help of contour lines. The height of the section

Draw a hill with a height of 21 m with the help of contour lines. The height of the section (the difference in heights of adjacent contour lines) is 5 m. It is known that the western slope of the hill is gentler than the eastern one.

The contours depicting the hill resemble jagged ovals. You need to draw 4 such ovals. Three ovals at the same distance from each other, since the height of the section is 5 m. Draw one oval, inside the first – the second, inside the second – the third and crowned with 4 oval – this is the top of the hill. The western slope (left) is steep – here the contours should be close to each other. The eastern slope is gentle – there is a greater distance between the contours. These contours should be equally spaced from each other. But the last horizontal line from the thirds should be drawn closer, since its section will not be 5 m, but 2.5 m.