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The phrase "90-degree angle" is correct and usable in written English
It is commonly used in mathematics and engineering when referring to an angle that forms a right angle. For example: "The brick wall had a 90-degree angle between each corner."
Exact(25)
"Stand at a 90-degree angle from the goal posts.
You don't want to be at less than a 90-degree angle when you're eating.
Zeal for the 90-degree angle allowed Americans to rush in bursts across the continent.
"I had it set at a 45-degree angle, not a 90-degree angle".
A film inside the screen receives light from a 90-degree angle.
"You see the picture and they're almost at a 90-degree angle," he said, still amazed.
Similar(34)
Now, make another series of cuts at a 90 degree angle to the first.
You can twist it to a 90 degree angle without it breaking or even shattering the pastry skin.
Fixing the kitchen counter so I no longer had to chop vegetables at a 90 degree angle.
Now you have a 90 degree angle!
It should form a 90 degree angle.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com