Woodworking : how do I make this cut?

[Healthie]

See the picture. I believe this is a 20 degree angle; I can’t figure out where to put my stop block to make this cut. This is from Steve Ramsay’s WWMM video on clamp racks

[Uturn]

Jig saw or band saw. You can make a jig at that angle to run the base of the jig saw against for repeatability.

Chop saw would do it too.

[fixie]

If you have a chop/miter saw that would be ideal.  Assuming you are not limited to the amount of wood available, make a 90 degree cut that represents the short end before the angle.  Next, make another cut at 90 degrees that represents the long cut on the second workpiece.  Then,  mark the 20 degree angle, clamp them both down, and make the 20 degree cut thru both pieces.  If extreme accuracy is needed, remember that the width of the sawblade should be taken into account.  This allows you to ignore the stop block.
I hope this makes sense.
If the 20 degree angle is important to the build, you can use geometry or trig to figure out the angle based on the dimensions in the drawing.

[Fishindude]

I'd just mark my cut lines with a pencil and freehand cut it on the table saw.
It I was making a whole bunch of identical pieces, I'd freehand cut the first one, use it for a template, then set the proper angle for cuts and make them with a table saw.

[nereo]

I'd just mark my cut lines with a pencil and freehand cut it on the table saw.
It I was making a whole bunch of identical pieces, I'd freehand cut the first one, use it for a template, then set the proper angle for cuts and make them with a table saw.

Sorry, but I gotta be the Safety Police here and say Please Don't Do This ^^  !!
It's not safe to put your hands < 4" from the table-saw blade to freehand a cut.  Especially if you are a relative novice to woodworking who is asking a legitimate question such as this.  Tablesaws will take your fingers very quickly.

[kenmoremmm]

circular saw with a guide. easy. or freehand it if you have good enough skills.

[Fishindude]

I'd just mark my cut lines with a pencil and freehand cut it on the table saw.
It I was making a whole bunch of identical pieces, I'd freehand cut the first one, use it for a template, then set the proper angle for cuts and make them with a table saw.

Sorry, but I gotta be the Safety Police here and say Please Don't Do This ^^  !!
It's not safe to put your hands < 4" from the table-saw blade to freehand a cut.  Especially if you are a relative novice to woodworking who is asking a legitimate question such as this.  Tablesaws will take your fingers very quickly.

No kidding?   Any power tool can eat you up if you don't know what you are doing.
Sounds like you've not used a table saw much and know very little about it.   I'm quite certain I can make those cuts without endangering or taking off any digits.
There are plenty of ways to make those cuts safely.   They make tools and jigs to keep your hands out of the danger zone, and you can make your own guides and pushers if necessary.

[nereo]

I'd just mark my cut lines with a pencil and freehand cut it on the table saw.
It I was making a whole bunch of identical pieces, I'd freehand cut the first one, use it for a template, then set the proper angle for cuts and make them with a table saw.

Sorry, but I gotta be the Safety Police here and say Please Don't Do This ^^  !!
It's not safe to put your hands < 4" from the table-saw blade to freehand a cut.  Especially if you are a relative novice to woodworking who is asking a legitimate question such as this.  Tablesaws will take your fingers very quickly.

No kidding?   Any power tool can eat you up if you don't know what you are doing.
Sounds like you've not used a table saw much and know very little about it.   I'm quite certain I can make those cuts without endangering or taking off any digits.
There are plenty of ways to make those cuts safely.   They make tools and jigs to keep your hands out of the danger zone, and you can make your own guides and pushers if necessary

Take the OP’s experience into consideration, not my own.  I’m quite experienced with a table saw.  The OP needs help making a relatively simple angled cut in a 4” x 5” piece of wood.  Telling him/her “I would just free hand it” is a dangerous thing to say to a novice, because he/she could reasonable think “oh, I should just freehand that cut then!”.

No.  You don’t put your fingers within a couple inches of a blade.  As you said, you can safely make the cut by using a jig and/or push blocks.  Not free-hand.