Topic 16

All triangles can be classified

• 1 way

• 2 ways

• 3 ways

• 4 ways

3 sides the same

• isosceles

• obtuse

• scalene

• equilateral

2 sides the same

• equilateral

• obtuse

• scalene

• isosceles

no sides the same

• acute

• equilateral

• scalene

• isosceles

sides all 2 inches

• scalene

• equilateral

• obtuse

• acute

sides 1 inch, 2 inches, 4 inches

• acute

• obtuse

• scalene

• isosceles

angles all 89 degrees or less

• acute

• obtuse

• scalene

• right

has an angle of exactly 90 degrees

• isosceles

• obtuse

• right

• acute

one angle 91 degrees or more

• acute

• obtuse

• right

• equilateral

angles 90 degrees, 45 degrees, 45 degrees

• acute

• scalene

• right

• isosceles