Classifying Triangles

Front

What is a triangle classified by its sides?

Back

A triangle can be classified as Equilateral (all sides equal), Isosceles (two sides equal), or Scalene (no sides equal).

Front

What is a triangle classified by its angles?

Back

A triangle can be classified as Acute (all angles less than 90°), Right (one angle equal to 90°), or Obtuse (one angle greater than 90°).

Front

Define an Acute Scalene triangle.

Back

An Acute Scalene triangle has all angles less than 90° and all sides of different lengths.

Front

Define an Acute Isosceles triangle.

Back

An Acute Isosceles triangle has two equal sides and two equal angles, with all angles less than 90°.

Front

Define an Obtuse Scalene triangle.

Back

An Obtuse Scalene triangle has one angle greater than 90° and all sides of different lengths.

Front

Define an Obtuse Isosceles triangle.

Back

An Obtuse Isosceles triangle has one angle greater than 90° and two equal sides.

Front

What is a Right Isosceles triangle?

Back

A Right Isosceles triangle has one angle equal to 90° and two equal sides.

Front

What is an Equilateral triangle?

Back

An Equilateral triangle has all three sides equal and all angles equal to 60°.

Front

How do you find the value of x in a triangle?

Back

Use the properties of triangles, such as the sum of angles in a triangle equals 180°, or apply the Pythagorean theorem for right triangles.

Front

What is the sum of the angles in any triangle?

Back

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