Classify Triangles

Use the angles to classify the triangles

Use the sides to identify the triangle

0 sides the same - scalene triangle

2 sides the same - isosceles triangle

3 sides the same - equilateral triangle

Use the sides to identify the triangle

0 sides the same - scalene triangle

2 sides the same - isosceles triangle

3 sides the same - equilateral triangle

Use the sides to identify the triangle

0 sides the same - scalene triangle

2 sides the same - isosceles triangle

3 sides the same - equilateral triangle

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.

This is a right triangle because —

• it is facing the right way

• it has 3 acute angles

• it has one 90 degree angle

• it does not have one obtuse angle

Sofia drew this triangle. Classify it TWO ways.

• right

• isosceles

• acute

• scalene

Why is the triangle classified as isosceles?

• All angles are acute

• At least two sides are congruent

• At least one angle is acute

• All angles are congruent

LOOKING AT ANGLES: WHAT TYPE OF TRIANGLE IS THIS? HINT: ONE ANGLE = 90 DEGREES

• ACUTE

• OBTUSE

• RIGHT

Which words best describe this triangle?

• Right

• Acute

• Obtuse

• Isosceles

• Scalene