Triangle Classification by Angles

What type of triangle has all three angles less than 90 degrees?

• Obtuse triangle

• Acute triangle

• Right triangle

• Equilateral triangle

What type of triangle has one angle that is exactly 90 degrees?

• Equilateral triangle

• Isosceles triangle

• Scalene triangle

• Right-angled triangle

What type of triangle has one angle that is greater than 90 degrees?

• Right triangle

• Obtuse triangle

• Acute triangle

• Equilateral triangle

What type of triangle has all three angles equal to 60 degrees?

• Isosceles triangle

• Scalene triangle

• Equilateral triangle

• Right-angled triangle

What type of triangle has one angle that is exactly 180 degrees?

• Straight angle triangle

• Equilateral triangle

• Acute angle triangle

• Obtuse angle triangle