It could be a square, rectangle, kite, rhombus ... As we know this is a kite, we then know from the properties of a kite that the angle opposite \(87^\circ\) is also \(87^\circ\).

Quadrilaterals are 2D shapes with four sides and angles. There are six special quadrilaterals with different properties. A rectangle has two pairs of equal sides. It has four right angles (90°).