Classifying Triangles

4.6C

• A

• B

• C

• D

4.6C

• A

• B

• C

• D

4.6C

• A

• B

• C

• D

4.6C

• A

• B

• C

• D

• Acute only

• Equilateral only

• Acute and isosceles only

• Acute, isosceles, and equilateral only

Select the correct words to define the triangle shown in the picture.

The picture shows a(n) ​ ​ (a)   ​ ​ (b)   triangle.

• acute

• right

• isosceles

• equilateral

• obtuse

• scalene

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.

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

• ACUTE

• OBTUSE

• RIGHT

A right triangle is...

• a triangle with a 90 degree angle

• a triangle with all angles less than 90 degrees

• a triangle with an angle bigger than 90 degrees

This Venn diagram shows the relationship between some types of triangles.

Which triangle belongs in the intersection of “Acute triangles” and “Isosceles triangles”?

(Hint: Use a dictionary to look up what acute and isosceles means if you do not know.)

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