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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.
All quadrilaterals have 4 sides. A square has got 4 sides of equal length and 4 right angles (right angle = 90 degrees). A Rhombus has got 4 sides of equal length and opposite sides are parallel and angles are equal. The rectangle (oblong) contains 4 right angles (an angle of 90Ë).quare. A square has got 4 sides of equal length and 4 right angles (right angle = 90 degrees). Since ALL the angles in a quadrilateral add up to 360 then 360 divided by 4 must be 90.