Classifying Triangles 5th Grade

How do you classify triangles by their sides?

• Isosceles, equilateral, or scalene

• Acute, obtuse, or right

• Regular, irregular, or symmetrical

• Convex, concave, or polygonal

How do you classify triangles by their angles?

• Acute, right, or obtuse

• Equilateral, isosceles, or scalene

• Congruent, similar, or asymmetric

• Obtuse, reflex, or straight

If a triangle has one angle greater than 90 degrees, what type of triangle is it?

• Acute triangle

• Right triangle

• Obtuse triangle

• Equilateral triangle

What is an acute triangle?

• A triangle where all three angles are less than 90 degrees.

• A triangle with one angle greater than 90 degrees.

• A triangle with two equal sides.

• A triangle where all angles are equal to 90 degrees.

What is an obtuse triangle?

• A triangle that has one angle greater than 90 degrees.

• A triangle with all angles less than 90 degrees.

• A triangle that has two equal sides.

• A triangle that has three sides of different lengths.

If a triangle has all angles less than 90 degrees, what type of triangle is it?

• Acute triangle

• Obtuse triangle

• Right triangle

• Scalene triangle

What is a scalene triangle?

• A triangle with all sides of equal lengths.

• A triangle with two sides of equal lengths.

• A triangle with all sides of different lengths.

• A triangle with one right angle.

What is a right triangle?

• A triangle that has one angle equal to 90 degrees.

• A triangle with all sides of equal length.

• A triangle that has no angles equal to 90 degrees.

• A triangle that has two angles equal to 45 degrees.

What is an equilateral triangle?

• A triangle with all three sides of equal length.

• A triangle with one angle greater than 90 degrees.

• A triangle with two sides of equal length.

• A triangle that has no equal sides.

Can a triangle be both isosceles and obtuse?

• No, a triangle cannot be both isosceles and obtuse.

• Yes, a triangle can be isosceles and have one obtuse angle.

• Only if it has two obtuse angles.

• Only if it is also equilateral.