Who is considered the 'Father of Geometry'?
What is Euclid's fifth postulate (the Parallel Postulate)?
What is a postulate (axiom)?
What is a theorem?
What are vertical angles?
What are supplementary angles?
What are complementary angles?
What is the sum of the interior angles of a triangle?
What is the sum of the interior angles of a quadrilateral?
What is the formula for the sum of interior angles of an n-sided polygon?