Triangles, Triangles, Triangles!

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

What does it mean for two triangles to be congruent?

Back

Two triangles are congruent if they have the same size and shape, meaning their corresponding sides and angles are equal.

Front

What is the SSS congruence criterion?

Back

The SSS (Side-Side-Side) congruence criterion states that if three sides of one triangle are equal to three sides of another triangle, then the triangles are congruent.

Front

What is the SAS congruence criterion?

Back

The SAS (Side-Angle-Side) congruence criterion states that if two sides and the included angle of one triangle are equal to two sides and the included angle of another triangle, then the triangles are congruent.

Front

What is an acute triangle?

Back

An acute triangle is a triangle where all three interior angles are less than 90 degrees.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle where all three sides are of different lengths.

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle where all three sides are equal in length and all three angles are equal, each measuring 60 degrees.

Front

Back

Front

What is the relationship between corresponding angles of congruent triangles?

Back

The corresponding angles of congruent triangles are equal.

Front

How do you classify triangles based on their angles?

Back

Triangles can be classified as acute (all angles < 90°), right (one angle = 90°), or obtuse (one angle > 90°).