: Statements accepted as true without proof (e.g., a straight line can be drawn between any two points). Essential Theorems

: Drawing a line through a point that never touches another line. Construction Rules No Measuring : You cannot use the numbers on a ruler.

The interior angles of any triangle always add up to exactly 180∘180 raised to the composed with power 3. Vertical Angles Theorem

: Finding the exact midpoint of a line. Angle Bisector : Dividing an angle into two equal parts. Perpendicular Lines : Creating a 90∘90 raised to the composed with power intersection.