Classifying Triangles

What defines a scalene triangle?

• All three sides have equal lengths.

• At least two sides have equal lengths.

• None of the sides have equal lengths.

• It has one angle that is exactly 90 degrees.

Which statement accurately describes the relationship between isosceles and equilateral triangles?

• All isosceles triangles are also equilateral triangles.

• All equilateral triangles are also isosceles triangles.

• Isosceles and equilateral triangles are completely separate categories.

• An isosceles triangle has exactly two equal sides, while an equilateral triangle has exactly three.

What is a characteristic of an acute triangle?

• It has one angle that is exactly 90 degrees.

• All of its angles are less than 90 degrees.

• It has one angle that is larger than 90 degrees.

• All of its sides are equal in length.

How is a right triangle identified?

• It has at least two equal sides.

• All of its angles are less than 90 degrees.

• It contains one angle that measures exactly 90 degrees.

• It contains one angle that measures more than 90 degrees.