Ch. 4: Congruent Triangles

Front

What is a congruent triangle?

Back

Triangles that are identical in shape and size, meaning all corresponding sides and angles are equal.

Front

What is the distance formula?

Back

The distance between two points (x1, y1) and (x2, y2) is given by: d = √((x2 - x1)² + (y2 - y1)²).

Front

What type of triangle has all sides of different lengths?

Back

Scalene triangle.

Front

What type of triangle has at least two sides of equal length?

Back

Isosceles triangle.

Front

What is the definition of an acute triangle?

Back

A triangle where all three angles are less than 90 degrees.

Front

What is the definition of an obtuse triangle?

Back

A triangle that has one angle greater than 90 degrees.

Front

What does ASA stand for in triangle congruence?

Back

Angle-Side-Angle; a method to prove triangles are congruent by two angles and the included side.

Front

What does AAS stand for in triangle congruence?

Back

Angle-Angle-Side; a method to prove triangles are congruent by two angles and a non-included side.

Front

What does SAS stand for in triangle congruence?

Back

Side-Angle-Side; a method to prove triangles are congruent by two sides and the included angle.

Front

What is the Reflexive Property in geometry?

Back

A property stating that any geometric figure is congruent to itself.