Using the same method, we can find B = 49.981°. To find angle A, we plug our known values into the law of cosine angle formula for A: Where a, b, and c are the sides of the triangle and A, B, and C are their corresponding angles.įind the missing sides and angles of the scalene triangle below using the law of cosines. It can be used to find the sides and angles of any triangle given 3 known values (angles or sides). The law of sines is a formula that relates the sides and angles of a triangle. To find the sides and angles of a scalene triangle, we can use the law of sines and law of cosines. ![]() How to find the sides of a scalene triangle The figure below shows a scalene right triangle example.īelow are formulas for finding the sides, angles, area, and perimeter of a scalene triangle. ![]() The figure below shows an obtuse scalene triangle example:Ī right scalene triangle is a triangle that has one angle that measures 90° and has no congruent sides or angles the remaining angles are acute. The figure below shows an acute scalene triangle example:Īn obtuse scalene triangle is a triangle in which one of the angles is obtuse and none of the sides or angles are congruent the remaining two angles are acute. Acute scalene triangleĪn acute scalene triangle is a triangle that has no congruent sides or angles in which all the angles are acute. Scalene triangles can be acute, obtuse, or right.
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