A kite is a romboidal figure. Have four lines of perimeter.
Then is formed by 3 areas, 2 triangles and 1 rectangle
Area of triangle is (10.2-4.93)xH
now find H = √[8.5^2-((10.2-4.93)/2)^2]
Now then find area of rectangle
is 4.93xH
Then rest to add both results, to find area of this Kite