Triangle Classification Quiz

What is the defining characteristic of an acute triangle?

• It has one angle greater than 90 degrees.

• All angles are less than 90 degrees.

• It has one angle exactly 90 degrees.

• All sides are of different lengths.

Which type of triangle has one angle exactly 90 degrees?

• Equilateral triangle

• Right triangle

• Obtuse triangle

• Acute triangle

What is a key feature of a scalene triangle?

• It has two equal sides.

• It has one right angle.

• No sides or angles are congruent.

• All sides are equal.

How many congruent sides does an isosceles triangle have?

• None

• One

• Two

• Three

What does 'equilateral' mean in the context of triangles?

• It has one obtuse angle.

• It has two equal sides.

• All sides and angles are equal.

• All angles are different.

Which combination of classifications is possible for a triangle?

• Right scalene

• Right equilateral

• Obtuse equilateral

• Acute scalene

What is the vertex in a triangle?

• The angle opposite the longest side

• The point where two sides meet

• The midpoint of a side

• The longest side

In a triangle with angles 30°, 50°, and 100°, what type of triangle is it based on angles?

• Equilateral triangle

• Obtuse triangle

• Right triangle

• Acute triangle

If a triangle has sides of lengths 4, 4, and 4, what type of triangle is it based on sides?

• Right triangle

• Scalene triangle

• Isosceles triangle

• Equilateral triangle

What is the classification of a triangle with one obtuse angle and two equal sides?

• Acute isosceles

• Obtuse scalene

• Right isosceles

• Obtuse isosceles