Classifying Triangles by Sides and Angles

In this video, Mr. J guides fifth-grade students through a mastery check on classifying triangles. The video begins with an introduction and instructions for the exercise, followed by a pause for students to complete the task independently. Afterward, Mr. J reviews the classification of six triangles by their sides and angles, providing detailed explanations for each. The video concludes with a summary and a link to an additional instructional video for further learning.

What should you do if you need more help understanding triangle classification?

• Skip the mastery check entirely.

• Watch the instructional video linked in the description.

• Only classify triangles by their sides.

• Guess the answers without trying.

Tags

CCSS.4.G.A.2

What is the first step to take in the mastery check?

• Classify triangles by their angles only.

• Start with classifying the largest triangle.

• Watch the entire video without pausing.

• Pause the video and attempt all six problems.

Tags

CCSS.4.G.A.2

What type of triangle has two congruent sides?

• Acute

• Isosceles

• Scalene

• Equilateral

Tags

CCSS.4.G.A.2

Which triangle is classified as both isosceles and acute?

• Triangle 6

• Triangle 2

• Triangle 1

• Triangle 4

Tags

CCSS.4.G.A.2

What defines a right triangle?

• All angles less than 90 degrees

• One angle exactly 90 degrees

• All sides are congruent

• Two sides are congruent

Tags

CCSS.4.G.A.2

Which triangle is considered scalene?

• Triangle 3

• Triangle 1

• Triangle 2

• Triangle 5

Tags

CCSS.4.G.A.2

What characteristic does an obtuse triangle have?

• All angles are less than 90 degrees

• One angle is greater than 90 degrees

• Two sides are the same length

• All sides are the same length

Tags

CCSS.4.G.A.2

Which triangle is classified as equilateral?

• Triangle 1

• Triangle 3

• Triangle 5

• Triangle 6

Tags

CCSS.4.G.A.2

How many triangles were classified as acute?

• Five

• Two

• Three

• Four

Tags

CCSS.4.G.A.2

Which of the following is NOT a correct classification in the mastery check?

• Triangle 5 as scalene and obtuse

• Triangle 6 as isosceles and right

• Triangle 2 as scalene and right

• Triangle 3 as equilateral and acute

Tags

CCSS.4.G.A.2