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When you add all four sides of a quadrilateral(all parallelograms are quadrilateral), It must equal 360 degrees. So what you do is you add up the three angles that are given, them subtract that sum from 360.
A = LW divide by W to both sides A/W = L
Well, darling, to find the area of a shape, you need to know the shape itself! If those numbers represent the sides of a rectangle, you can pair them up to find the length and width. Then, just multiply the length by the width to get the area. So, in this case, the area would be 36 square centimeters.
Only the base in not enough information. You can find the area if you are given the other two sides, or two angles, or a side and an angle, or measures of other features. However, the answer depends on the information given and the formula is likely to be different in each case.
A trapezium has a pair of parallel sides of different lengths so in order to find its 2nd parallel side the information given must include its height.