- flip in your mind the top part to the bottem then you have an area with a hole
- Calculate squarw (assuming no hole) 20m x 20m = 400m2
3 calculate size of the hole 15m x 10m =150m2 - Total area = 400m2 - 150m2 =250 m²
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Wrong
Ahh i see the error:
Total area 275m2