Classifying Triangles

Front

What are the angles of triangle ABC?

Back

The angles of triangle ABC are \( \angle A, \angle B, \angle C \).

Front

What is the name of triangle DEF?

Back

The name of triangle DEF is \( \Delta ABC \).

Front

What are the sides of triangle ABC?

Back

The sides of triangle ABC are \( \overline{AB}, \overline{BC}, \overline{AC} \).

Front

What defines an acute triangle?

Back

An acute triangle has all angles that are less than 90°.

Front

What defines a right triangle?

Back

A right triangle has one right (90°) angle.

Front

What defines an obtuse triangle?

Back

An obtuse triangle has one angle greater than 90°.

Front

How many sides does a triangle have?

Back

A triangle has three sides.

Front

What is the sum of the angles in any triangle?

Back

The sum of the angles in any triangle is 180°.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle with all sides of different lengths.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle with at least two sides of equal length.