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The sum of the angles equals 90 degrees (22.5° +67.5°= 90°). It is also obvious from a visual check when using a protractor that where the instruments displays 22.5° is actually 67.5° on the protractor. Many newer slide miters and miter boxes display both angles. Some of the new calculators have a 0° and a 90° references.
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The 67th parallel north is a circle of latitude that is 67 degrees north of the Earth's equatorial plane, about 50 km north of the Arctic Circle.It crosses the Atlantic Ocean, Europe, Asia and North America.