Understanding Triangles

The video tutorial introduces six types of triangles, divided into two groups based on sides and angles. The first group includes equilateral, isosceles, and scalene triangles, focusing on side lengths. The second group covers right, obtuse, and acute triangles, emphasizing internal angles. Each type is explained with its unique properties, such as equal sides in equilateral triangles or a right angle in right triangles. The tutorial concludes with a classification of triangles by sides and angles, providing a comprehensive understanding of triangle types.

How many different groups of triangles are there?

• 6

• 5

• 4

• 3

Tags

CCSS.2.G.A.1

What is a key characteristic of an equilateral triangle?

• Two sides are equal

• All sides are equal

• One angle is 90 degrees

• All sides are different lengths

Tags

CCSS.8.G.A.5

What is the measure of each internal angle in an equilateral triangle?

• 120 degrees

• 45 degrees

• 90 degrees

• 60 degrees

In an isosceles triangle, what do we call the sides that are of equal length?

• Legs

• Hypotenuse

• Arms

• Base

What is the name of the side in an isosceles triangle that is not equal to the other two?

• Hypotenuse

• Leg

• Arm

• Base

Tags

CCSS.4.G.A.2

What is a defining feature of a scalene triangle?

• All sides are different lengths

• Two sides are equal

• All sides are equal

• One angle is 90 degrees

Tags

CCSS.4.G.A.2

In a scalene triangle, how do the internal angles compare?

• All angles are equal

• Two angles are equal

• One angle is 90 degrees

• All angles are different

Tags

CCSS.4.G.A.2

What is a right triangle characterized by?

• All angles are acute

• One angle is obtuse

• All sides are equal

• One angle is 90 degrees

What do we call the side opposite the right angle in a right triangle?

• Leg

• Hypotenuse

• Arm

• Base

Tags

CCSS.4.G.A.2

What type of triangle has one angle greater than 90 degrees?

• Acute triangle

• Right triangle

• Equilateral triangle

• Obtuse triangle

Tags

CCSS.4.G.A.2