On a recent afternoon with springtime in the rising breeze, something else wonderful was in the air: a kite. Shortly, a ...

The area of a kite is found in the same way as a rhombus, that is by splitting it into two triangles.

So we must have an angle of \(50^\circ\) in the top left triangle. As we know this is a kite, we then know from the properties of a kite that the angle opposite \(87^\circ\) is also \(87^\circ\).