How to miter triangular strips?

[Hammare&Spik]

Hello. We have a window that we want to put triangular strips around on all four sides. They should meet along the edges at 45-degree angles. I don't understand how to miter them (that is, how to hold them in the miter saw for the angle to be correct around the corners.
Can someone help me with this?
Linking picture of the window and the triangular strip.

regards

 

[Kane]

Lay it like in the picture and set the saw at 45 degrees. Then place it on the other side of the saw and turn the saw 45 degrees in the opposite direction.
By the way, that's not a trekantslist.

 

[Hammare&Spik]

Place it as shown in the picture and set the saw at 45 degrees. Then you place it on the other side of the saw and turn the saw to 45 degrees in the other direction.
By the way, that's not a triangle strip.

This is what the strip actually looks like. Unsure if it’s a quarter round or a triangle strip?
Okay, so you hold it in the saw with the "nice" side facing up. Miter one corner at 45, then turn the saw so it miters 45 in the other direction only?

 

[Kane]

This is what the trim really looks like. Uncertain if it's a quarter-round or a triangular trim?
Okay, so you hold it in the saw with the "nice" side facing upwards. Mitre one corner at 45, then you just turn the saw to mitre the other way at 45?

Yes.

 

[AndersS]

Take some scrap pieces and test saw, the best way to learn to cut but also to do carpentry.

 

[Workingclasshero]

Determine what is up/forward/down, and keep the molding in that grip and never twist it.

Baseboards should thus remain upright even when cutting.
Window moldings, always with the front all the way to the cuts, where it must be twisted to lie down.
Crown moldings, always with the top side up even when cutting.

That's how I started, and then it went smoothly.

There are many ways to think about it, but this method is a good start for understanding how to cut.

I've built a six-sided tower with 3 floors, so I've learned ;-)

 

[Hammare&Spik]

Determine what is up/forward/down, and keep the moulding in that grip and never twist it.

Floor mouldings should always stay upright even when cutting.
Window mouldings should always have the front facing forward all the way to the cuts, where it has to be twisted to lay down.
Ceiling mouldings, always with the top side up even when cutting.

That's how I did it at first and then it just went smoothly.

There are many ways to think about it, but this way is a good start to understand how it should be cut.

I've built a 6-sided tower over 3 floors so I've learned ;-)

Thanks for the tips! I'll try today,
Cool with the tower