# How to Calculate Angles Without a Protractor?

A protractor is required to directly calculate the measure of an angle, but you can use geometric properties of triangles to make an indirect measure of the angle. Use the sine formula to infer the...
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http://www.ehow.com/how_8143890_calculate-angles-protractor.html

## How to Figure Out Angles Without a Protractor?

There are many situations when you need to find an angle but cannot use a protractor. For example, if you want to find the angle of a roof, it is not always feasible to measure it with a protracto...
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http://www.ehow.com/how_8419419_figure-out-angles-protractor.html

## How to Calculate Arc Lengths Without Angles?

Calculation of an arc length without its central angle is a tough problem since the arc length is based on the angle. The arc length is the measured distance along a circle's circumference. Its cal...
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http://www.ehow.com/how_8059022_calculate-arc-lengths-angles.html

## How to Find an Angle Without a Protractor?

Finding the exact measure of an angle requires the use of a protractor or other mathematical instrument, but you can use formulas from trigonometry to get a very close approximation of the angle. T...
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http://www.ehow.com/how_8288665_angle-protractor.html

## How to Measure an Angle Without a Protractor?

Measuring angles without a protractor is one of the fundamental aspects of geometry. Sine, cosine, and tangent are three concepts that will allow you to calculate an angle based solely on the lengt...
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http://www.ehow.com/how_7364713_measure-angle-protractor.html