Classifying Triangles 5th Grade

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

• Acute triangle

• Obtuse triangle

• Right triangle

• Scalene triangle

Tags

CCSS.4.G.A.2

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 with one angle equal to 90 degrees.

Tags

CCSS.4.G.A.2

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.

Tags

CCSS.4.G.A.2

What is the definition of a triangle?

• A polygon with three edges and three vertices.

• A shape with four equal sides.

• A closed figure with two parallel sides.

• A three-dimensional shape with six faces.

Tags

CCSS.2.G.A.1

Can a triangle be both equilateral and acute?

• Yes, all angles in an equilateral triangle are acute.

• No, an equilateral triangle cannot have acute angles.

• Yes, but only if it has one right angle.

• No, equilateral triangles must have at least one obtuse angle.

Tags

CCSS.4.G.A.2

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 and one angle less than 90 degrees.

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

Tags

CCSS.4.G.A.2

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.

Tags

CCSS.4.G.A.2

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.

Tags

CCSS.4.G.A.2

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.

Tags

CCSS.4.G.A.2

What is the sum of the angles in any triangle?

• 150 degrees

• 180 degrees

• 90 degrees

• 360 degrees

Tags

CCSS.8.G.A.5