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An angle that opens one-third of a whole circle is 120 degrees. To find the angle of a triangle given two sides, use the Law of Cosines. The total degree of a triangle is 180 degrees.
To calculate the angle for the first case is to divide 360 degrees (the total amount of degrees in a circle) by 3 (the number of parts the circle is being divided into). 360 divided by 3 is equal to 120. Therefore, the angle is 120 degrees. To find the angle of a triangle given two sides, use the Law of Cosines. The Law of Cosines states that for any triangle ABC, we have the equation c2 = a2 + b2 - 2abcos(C), where c is the length of the side opposite the angle C, a and b are the lengths of the other two sides, and C is the angle opposite the side c. The total degrees of a triangle is 180°. This is because of the Triangle Angle Sum Theorem which states that the sum of the angles of any triangle is equal to 180°.
To know more about an angle refer to the link brainly.com/question/28451077
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