Geo H - 4.1 Classifying Triangles

Classifying Triangles

By Ethan Lamont

Acute - All angles are less than 90^o
Right - One angle is exactly 90^o
Obtuse - One angle is greater than 90^o
Equiangular - All angles are congruent

By angles

Scalene - No sides are congruent
Isosceles - Two sides (and angles) are congruent
Equilateral - All sides (and angles) are congruent

By sides

Classifying Triangles

Multiple Select

Classify this triangle using two classifications

• Isosceles

• Equilateral

• Acute

• Right

Multiple Select

Classify this triangle using two classifications

• Equilateral

• Acute

• Scalene

• Equiangular

Multiple Select

Classify the triangle using two classifications

• Equilateral

• Equiangular

• Right

• Scalene

Multiple Select

Classify this triangle using two classifications

• Obtuse

• Acute

• Scalene

• Isosceles

Multiple Select

Classify this triangle using two classifications

• Right

• Obtuse

• Scalene

• Isosceles

Match

Classify each triangle

• 1.

• 2.

• 3.

• 4.

• 5.

Right Isosceles

Obtuse Scalene

Equilateral and Equiangular

Acute Scalene

Acute Isosceles

• Right Isosceles

• Obtuse Scalene

• Equilateral and Equiangular

• Acute Scalene

• Acute Isosceles

Classifying using Distance

Remember the Distance Formula?

​Classify the triangle

Multiple Choice

Classify the triangle by sides

• Scalene

• Isosceles

• Equilateral

• None of the above

​Classify the triangle

Multiple Choice

Classify the triangle by sides

• Scalene

• Isosceles

• Equilateral

• None of the above

Classify the triangle with vertices
​
A:(-4, 0); B:(-1, 6); and C:(3, -1)

Multiple Choice

Classify the triangle with vertices
​
A:(-4, 0); B:(-1, 6); and C:(3, -1)

• Scalene

• Isosceles

• Equilateral

• None of the Above

What did you learn?