Topic: Finding Unknown angles
Key Vocabulary: 1. Supplementary Angles : Two Angles are Supplementary when they add up to 180 degrees.
2. Complementary angles: Two Angles are Complementary when they add up to 90 degrees (a Right Angle).
3. Vertical angles: Vertical Angles are the angles opposite each other when two lines cross. They are always equal.
4. Adjacent Angles: Two Angles are Adjacent when they have a common side and a common vertex (corner point), and don’t overlap.
Prior Knowledge: Students should already have a clear idea about ( Acute, Obtuse, Reflex) angles and their measurement. In addition, they should also have had clear idea about the parts of a angle such as (The corner point of an angle is called the vertex) and ( the two straight sides are called arms) and how to give the angle a name, such as ABC or CBD