Line it up
What an angle is called when the lines containing it are straight.
What is rectilineal?
A name for the line that contains a circle.
What is circumference?
A rectilineal figure contained by four straight lines
What is a quadrilateral?
An angle less than a right angle.
What is acute?
The abbreviation placed at the end of a proposition that is proved by construction.
What is Q.E.F.?
Type of line set up on a straight line that makes adjacent angles which are right.
What is perpendicuar?
The bisector of a circle.
What is diameter?
An extremity of anything.
What is a boundary?
The inclination of two lines that lie in a plane, meet one another, but do not lie in a straight line.
What is a plane angle?
Words that stand for an exact restatement of the enunciation.
What is "Therefore, etc.?"
A straight line set up on another straight line makes two angles that together always equal ___________.
What are two right angles OR 180 degrees?
Allows us to describe a circle with any center and distance.
What is Postulate 3?
A quadrilateral figure which is right-angled but not equilateral.
What is an oblong?
Its common name is the Side-Angle-Side Theorem.
What is Proposition I.4?
Its common name is the Side-Side-Side Theorem.
What is Proposition I.8?
When two straight lines intersect each other, they make two _____________ ____________, which are equal to each other.
What are vertical angles?
Allows us to draw two circles with equal radii to ultimately construct an equilateral triangle.
What is Proposition I.1?
Two geometric figures are ________________ when they have exactly the same size and shape.
What is congruent?
Proved that a triangle with two equal ANGLES has opposite sides also equal.
What is Proposition I.6?
When one side of a triangle is extended to form an exterior angle, that angle is ___________ ________ either of the opposite interior angles.
What is greater than?
This tells that two straight lines constructed from the extremities of a given straight line to create a triangle cannot be equal to any other straight lines constructed from the same extremities (on the same side) and meeting at another point.
What is Proposition I.7?
An early step in this Proposition requires us to draw a CIRCLE which (1) has the given point as its center and (2) intersects the given line in 2 places, which will ultimately lead to constructing a straight line perpendicular to the given line.
What is Prop I.12?
A quadrilateral figure that has equal opposite sides and equal angles but is neither equilateral nor right-angled.
What is a rhomboid?
This allows us to bisect a rectilineal angle by first constructing an equilateral triangle and then a bisecting straight line.
What is Proposition I.9?
A statement accepted as true without proof (includes common notions and postulates.)
What is axiom?