Geometric Foundations Flashcard

Front

Which angles are vertical angles?

Back

Vertical angles are pairs of opposite angles formed by the intersection of two lines. For example, if two lines intersect, the angles opposite each other are vertical angles. In this case, ∠8 and ∠5 are vertical angles.

Front

What is a point where two or more line segments meet?

Back

A point where two or more line segments meet is called a Vertex.

Front

What is an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines?

Back

An angle of 90° is called a Right Angle.

Front

What are two angles that have a common vertex and a common side but do not overlap?

Back

These are called Adjacent Angles.

Front

What does it mean when two shapes are equal in size or shape?

Back

When two shapes are equal in size or shape, they are referred to as Congruent.

Front

What is the term for angles that add up to 180°?

Back

Angles that add up to 180° are called Supplementary Angles.

Front

What is the term for an angle less than 90°?

Back

An angle less than 90° is called an Acute Angle.

Front

What is the term for an angle greater than 90° but less than 180°?

Back

An angle greater than 90° but less than 180° is called an Obtuse Angle.

Front

What do you call a straight line that touches a curve at a single point?

Back

A straight line that touches a curve at a single point is called a Tangent.

Front

What is the term for a polygon with three sides?

Back

A polygon with three sides is called a Triangle.