Classifying Triangles

Front

What is a triangle classified by angles?

Back

Triangles can be classified as Acute (all angles < 90°), Right (one angle = 90°), or Obtuse (one angle > 90°).

Front

What is a triangle classified by sides?

Back

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

Front

What is an Obtuse Scalene triangle?

Back

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

Front

What is a Scalene triangle?

Back

A Scalene triangle has all sides of different lengths and no equal angles.

Front

What is an Isosceles triangle?

Back

An Isosceles triangle has at least two sides that are equal in length and the angles opposite those sides are equal.

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 classify a triangle with one angle measuring 90°?

Back

It is classified as a Right triangle.

Front

What is the distance formula used for?

Back

The distance formula is used to find the length of a side of a triangle given two points (x1, y1) and (x2, y2): d = √((x2 - x1)² + (y2 - y1)²).

Front

If triangle DEF has vertices D(8, -6), E(-1, -3), F(-2, 5), how do you classify it by sides?

Back

It is classified as Scalene because all sides have different lengths.

Front

What does it mean if a triangle is Acute Isosceles?

Back

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