2) Find the missing angle.

Solution:

This is a right-angled triangle, so one angle is \(90^{\circ}\). Another angle is given as \(45^{\circ}\).

The sum of angles in a triangle is \(180^{\circ}\).

Missing angle = \(180^{\circ} - 90^{\circ} - 45^{\circ} = 180^{\circ} - 135^{\circ} = 45^{\circ}\).

Answer: The missing angle is 45°.