after some months I am playing with sketch app but can't find the option to apply max. border radius on a rectangles upper half creating a complete arch.
Any ideas? In Illustrator this is dead simple.
You can achieve this by manually typing in a radius value larger than 100 in the object properties.
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To add to this answer: you first have to select the nodes that you want to set the radius value for, then type this in.– Tin ManJul 27 '17 at 21:18