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Classifying Angles As Acute, Obtuse, Right Or Reflex ...
Oct 12, 2018 · To classify an angle, first measure its size in degrees. Then compare this angle to the following values: If the angle is less than 90°, it is an acute angle. If the angle is exactly 90°, it is a right angle. If the angle is between 90° and 180°, it is an obtuse angle. If the angle is exactly 180°, it is a straight line.
Law Of Cosines - Wikipedia
Obtuse case. Figure 7b cuts a hexagon in two different ways into smaller pieces, yielding a proof of the law of cosines in the case that the angle γ is obtuse. We have in pink, the areas a 2, b 2, and −2ab cos γ on the left and c 2 on the right; in blue, the …