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The construction of a 90 degree angle (also called a right angle) can be justified using the fact that all right angles measure exactly 90 degrees. This can be demonstrated by constructing a triangle with three equal sides and then measuring the angles with a protractor; the result will be three angRead more

The construction of a 90 degree angle (also called a right angle) can be justified using the fact that all right angles measure exactly 90 degrees. This can be demonstrated by constructing a triangle with three equal sides and then measuring the angles with a protractor; the result will be three angles of exactly 90 degrees each.

Alternatively, it is possible to construct a 90 degree angle by drawing two lines that meet at a point, and then using a compass to draw a semicircle with its center at the junction of the two lines. Both of these techniques are valid ways of demonstrating that a 90 degree angle is indeed equal to exactly 90 degrees.

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