Attributes of a Triangle

A triangle with all angles less than 90 degrees and all sides of equal length

• equilateral acute

  triangle

• isosceles right

  triangle

• equilateral obtuse

  triangle

• scalene acute

  triangle

A triangle with one 90 degree angle and two sides of equal length

• isosceles right triangle

• isosceles obtuse triangle

• equilateral acute triangle

• scalene right

  triangle

a triangle with one angle over 90 degrees and no sides of equal length

• scalene obtuse triangle

• equilateral acute triangle

• scalene right triangle

• isosceles obtuse

  triangle

Which figures belong in the part of the organizer labeled “Isosceles triangles”?

• Figures II and V only

• Figures I, III, and V only

• Figures I and III only

• Figures II, IV, and V only

What are the attributes of a acute triangle?

• 3 acute angles

• 2 acute angles, 1 obtuse angle

• 1 acute angle, 2 right angles

• 3 acute angles, 1 right angle

What are the attributes of an acute triangle?

• It has 3 acute angles

• It has 2 acute angles

• It has 1 acute angle

• It has no acute angles

Lydia drew the Venn diagram behind...
Use the Venn diagram to answer the question that follows

• All isosceles triangles are equilateral.

• All equilateral triangles are isosceles.

• All equilateral triangles are scalene.

• All scalene triangles are isosceles.

Select two of the correct statements about the following triangle.

• This triangle has 2 congruent sides

• This triangle has 0 congruent sides

• This triangle has 3 congruent sides

• This triangle has all acute angles

• This triangle has 0 acute angles

This is an equilateral triangle. What are some attributes of this triangle?

• It only has 2 equal sides.

• All of the sides are equal.

• It has 3 angles.

• It doesn't have any equal sides.

What triangle is this?

• equilateral

• acute

• obtuse

• right