Base x height
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The angle opposite the 55 degree angle will also be 55 degrees. The other two angles will each measure 180 - 55 = 125 degrees.
How do you find the area of an unequal quadrangle?
To find the area of 11 and 18 you multiply it.
Area of what? Every geometrical shape has a different formula to find its area. The simplest one: to find the area of a rectangle whose edge lengths are h and w, area = h*w.
The measurements that you need to find the area of a square is Area = Length x Width.