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In the last lesson we used the Law of Cosines to find the length of the third side of a triangle when you know the length of two sides and the angle in between. This law can also be used to find the measure of an angle when the three sides of a triangle are given. To use the Law of Cosines to find an unknown angle: 1. Identify c as the side across from the angle you are trying to find. 2. Substitute the values into the Law of Cosines.
Rectangle. A rectangle is a parallelogram with 4 right angles. A rectangle has the following rules: (1) All the rules of a parallelogram. (2) Four right angles. Remember that a right angle measures 90 degrees. (3) Diagonals which are congruent (they have the same length). rhombus has the following rules: (1) All the rules of a parallelogram. (2) Four sides that have the same length. (3) Diagonals that intersect at right angles. (4) Diagonals that bisect opposite pairs of angles. Sample: Given that ABCD is a rhombus and the measure of angle D = 60 degrees.