3x5 =15m2

35/5 = 7 meters

3x5x0.5=7.5m2

72x(7.5+35)=3060

9.

It's simple. Draw a corner first, and then fix a few points.

10。

Just draw parallel lines and use triangles.

1 1。

First draw a vertical line along the line outside the street with the right angle of the triangle, and this line will pass through point P.

Then measure the length. Then calculate according to 1:20000= measured length: x, and it will be ok.