Author Archives: marina felamon

Second part of the project (finding Unknown Angles)

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


Topic: Finding Unknown Angles

Learning objectives: Students will be able to use  supplementary, complementary, vertical, and adjacent angles to find unknown angles  .In addition, they will be able to use facts ( such as the measurement of the supplementary , complementary, vertical, and adjacent) angles to solve multi steps problem ( that require students to do several steps for example finding X , students will need to do these steps 1. adding two angles together. 2. Subtracting them from the angle measurement in order to find to fix the measurement of X) and to solve simple equations for unknown angle in a figure ( find the X angle in the figure for example (x+30=90).


Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and use them to solve simple equations for an unknown angle in a figure.