An exterior angle of a triangle is equal to the sum of the two non-adjacent interior angles. This theorem provides another ...

Trigonometry close trigonometryThe study of sides and angles in triangles. can be used to find a missing angle in a right-angled triangle when two sides are known. An understanding of the three ...

Recall the Property: The diagonals of a rectangle are congruent (equal in length). Apply the Property: Therefore, EG = FH, ...

Before reading this guide, it may be helpful to read the guides from Module 1 on the properties of angles and the properties of 2D shapes. The sum of the angles inside any polygon can be found by ...