Triangle Adventures: Exploring Shapes and Angles!

Mathematics Grades 3rd Grade 1:31 Video
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Lesson Description

Let's learn all about triangles! Discover different types of triangles based on their angles and sides, and see where you can find them in the world around you.

Video Resource

6 Types of Triangles

Miacademy Learning Channel

Duration: 1:31
Watch on YouTube

Key Concepts

  • Triangles have three sides and three angles.
  • Triangles can be classified by their angles: acute, right, and obtuse.
  • Triangles can be classified by their sides: equilateral, isosceles, and scalene.

Learning Objectives

  • Students will be able to identify acute, right, and obtuse triangles.
  • Students will be able to identify equilateral, isosceles, and scalene triangles.
  • Students will be able to describe the characteristics of each type of triangle.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they already know about triangles. Show examples of triangles in everyday objects (e.g., pizza slice, road sign). Introduce the idea that triangles can be different shapes and sizes.
  • Video Viewing (5 mins)
    Play the '6 Types of Triangles' video from Miacademy Learning Channel (https://www.youtube.com/watch?v=VWDwAoScnUk). Encourage students to pay attention to the different types of triangles and their names.
  • Discussion and Examples (10 mins)
    After watching the video, discuss the different types of triangles. Draw examples of each type on the board and explain their characteristics. Ask students to provide real-world examples of where they might see these triangles.
  • Triangle Sort Activity (10 mins)
    Provide students with pre-cut triangle shapes of various types. Have them sort the triangles into groups based on their angles (acute, right, obtuse) and sides (equilateral, isosceles, scalene).
  • Wrap-up (5 mins)
    Review the different types of triangles and their characteristics. Answer any remaining questions. Preview the next lesson on quadrilaterals.

Interactive Exercises

  • Triangle Hunt
    Have students look around the classroom or at pictures to identify different types of triangles.
  • Draw Your Own Triangles
    Instruct students to draw at least one of each type of triangle (acute, right, obtuse, equilateral, isosceles, scalene), labeling each one. Provide protractors for optional angle measurement, but classification by visual estimation is acceptable.

Discussion Questions

  • What is a triangle?
  • What are the different types of angles we can find in triangles?
  • Can you think of any objects in the classroom that are shaped like triangles? What type of triangle is it?

Skills Developed

  • Shape recognition
  • Classification
  • Observation
  • Critical Thinking

Multiple Choice Questions

Question 1:

A triangle has how many sides?

Correct Answer: 3

Question 2:

Which triangle has one angle that is more than 90 degrees?

Correct Answer: Obtuse

Question 3:

What is a triangle with all three sides equal called?

Correct Answer: Equilateral

Question 4:

Which triangle has a 90-degree angle?

Correct Answer: Right

Question 5:

If a triangle has no equal sides, what kind of triangle is it?

Correct Answer: Scalene

Question 6:

An acute triangle has angles that are always:

Correct Answer: Less than 90 degrees

Question 7:

Which of these objects is shaped like a triangle?

Correct Answer: A pizza slice

Question 8:

How many sides are equal in an isosceles triangle?

Correct Answer: 2

Question 9:

What is the name for flat shapes with straight sides?

Correct Answer: Polygons

Question 10:

Which triangle has two equal angles?

Correct Answer: Isosceles

Fill in the Blank Questions

Question 1:

A triangle has three ______.

Correct Answer: sides

Question 2:

An _______ triangle has all sides equal.

Correct Answer: equilateral

Question 3:

A _______ triangle has one angle that is bigger than 90 degrees.

Correct Answer: obtuse

Question 4:

A _______ triangle has one 90-degree angle.

Correct Answer: right

Question 5:

A triangle with no equal sides is called a _______ triangle.

Correct Answer: scalene

Question 6:

An _______ triangle has two equal sides.

Correct Answer: isosceles

Question 7:

Angles that are smaller than 90 degrees are called _______ angles.

Correct Answer: acute

Question 8:

Triangles are a type of flat shape called a _______.

Correct Answer: polygon

Question 9:

All angles in a triangle add up to _______ degrees.

Correct Answer: 180

Question 10:

A pizza slice is often shaped like a _______.

Correct Answer: triangle

Educational Standards

3.GM.1:Analyze and use geometric attributes to describe and create polygons and three-dimensional figures in various contexts. 3.GM.1.3:Classify angles within a polygon as acute, right, obtuse, and straight.

Teaching Materials

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