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Help Removing spikes

Hello everyone,
I created three triangles by rotation and want them to cleanely merge at contact points without the edges sticking out. Could someone please help me with this? I tried several options but nothing worked. Ideally I don´t even have to remove the spikes but the parts cleanly merge when extruding.
When extruding them at the same time, I don´t get the Spikes, but the thickness of the triangles is not the same.
Thank you very much!
Emilia
Comments
https://cad.onshape.com/help/Content/deleteface.htm