A protractor
That tool is called a protractor.
The sextant.
A protractor.
To determine if the angle is < or> than 90 degrees so proper scale can be used
This depends on what you are measuring. A tool that can be used is a tape measure.
protractor
That tool is called a protractor.
Degrees
An angle ruler is a tool used to measuring angles like a protractor. An angle ruler is more accurate than a protractor.
Scoliometer-- A tool for measuring trunk asymmetry; it includes a bubble level and angle measure.
The sextant.
By measuring it using a suitable tool such as a ruler or caliper
A protractor.
Protractor
To determine if the angle is < or> than 90 degrees so proper scale can be used
To create a 90-degree angle using wood, you can use a carpenter's square or a right-angle tool to ensure that two pieces of wood meet at a perfect right angle. This tool helps in accurately measuring and marking the angle before cutting or joining the wood pieces together.
An angle measuring more than 90 degrees is obtuse. An angle measuring less than 90 degrees is acute. An angle measuring 90 degrees is right.