2.2 Comparing Angles
Roofs can have different steeps and have different slopes.  A steeper roof slopes with a greater angle than a roof which has less steep.
Large Roof Angle
Small Roof Angle

Equal Angles
If angles are equal then they are marked with one or more lines.

The figure shows a parallelogram where the opposite sides are parallel.  The opposite angles are then also equal.

ΛA = ΛC and ΛB = ΛD.

Which of these angles are bigger?

They are equal.