Classifying Triangles

Front

What is an acute triangle?

Back

An acute triangle is a triangle in which all three angles are acute angles (less than 90 degrees).

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle that is greater than 90 degrees.

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle equal to 90 degrees.

Front

How many sides does an equilateral triangle have?

Back

An equilateral triangle has three sides that are all congruent (equal in length).

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides that are congruent (equal in length).

Front

How many congruent sides does an isosceles triangle have?

Back

An isosceles triangle has 2 congruent sides.

Front

What is a scalene triangle?

Back

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

Front

What defines an equilateral triangle?

Back

An equilateral triangle is defined by having all three sides and all three angles equal.

Front

What is the sum of the angles in any triangle?

Back

The sum of the angles in any triangle is always 180 degrees.

Front

How can you classify a triangle based on its angles?

Back

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