If it looks less than 90o, greater than 90o, less than 180o, greater than 180o, less than 270o, greater than 270o, or less than 360o or greater than 360o.
The "Far Arc Near Arc theorem" is used in finding the angle measures of a secant.
Look at whether it is acute, obtuse or reflex. Then, look at the acute component of the angle and try to estimate whether it is half a right angle (45 deg), a third (30 deg) or two third (60 deg). If you are good, then you could try estimating "between a third and a half = 35-40 degrees".
Some of the devices used to measure angle are Transit, Protractor and Compass.
A sextant measures the angle of elevation between the horizon and the north star. Along with charts, it can be used to calculate your position on the sea fairly accurately.
Although minutes and seconds are used in measuring anglesm hours are not. The question, therefore, is meaningless.
The methods are subtraction. -- Subtract an angle from 90° to find its complementary angle. -- Subtract an angle from 180° to find its supplementary angle.
universal bevel protactor is an angle measuring instrument which measures acute angle ,obtuse angle as well as it is used to layout an angle. its least count is 5 minute.
A protractor measures degrees: 90, 80, 120 etc. If something is 90 degrees it is at a right angle
A protractor is used for measuring angles and the 3 angles in a triangle add up to 180 degrees.
Acute
To determine if the angle is < or> than 90 degrees so proper scale can be used
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