Intro to Triangle Properties

How many degrees is X?

• 37

• 47

• 7

• 90

What is the value of the missing angle?

• 90

• 100

• 20

• 120

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

How would you classify this triangle by it's sides and angles?

• Isosceles Acute

• Scalene Right

• Scalene Obtuse

• Isosceles Obtuse

• Isosceles Right

How would you classify this triangle by it's sides and angles?

• Scalene Acute

• Equilateral

• Scalene Obtuse

• Isosceles Acute

• Isosceles Obtuse

Side Classification: ​ (a)  

Angle Classification: ​ (b)  

• Scalene

• Right

• Isosceles

• Acute

• Obtuse

• Equilateral

Side Classification: ​ (a)  

Angle Classification: ​ (b)  

• Isosceles

• Acute

• Right

• Obtuse

• Equilateral

• Scalene

Side Classification: ​ (a)  

Angle Classification: ​ (b)  

• isosceles

• right

• scalene

• obtuse

• equilateral

• acute

Inside any triangle the sum of all the angles in degrees is always:

• 360

• 90

• 150

• |80

How much is the value of X?

• 45

• 60

• 90

• 15