1 of 31

Angles and Types of Triangles

4th Grade Mathematics

2 of 31

Types of Angles

  • Right
  • Straight
  • Obtuse
  • Acute

3 of 31

Right Angle

  • An angle measuring 90 º.

4 of 31

Right Angle

Real world example of a right angle:

5 of 31

Straight Angle

  • An angle measuring 180 º.

6 of 31

Straight Angle

Here is one example of a

straight angle:

7 of 31

Obtuse Angle

  • An angle whose measure is between 90º and 180º.

8 of 31

Obtuse Angle

Obtuse Angle

9 of 31

Acute Angle

  • An angle whose measure is between 0º and 90º.

10 of 31

An example of an acute angle

11 of 31

A fun video to help you learn even more.....

12 of 31

Types of Triangles

  • Equilateral Triangle
  • Isosceles Triangle
  • Scalene Triangle
  • Right Triangle

13 of 31

Introduction to Triangles:

Study Island link where we will watch the lesson video on triangles.

14 of 31

Equilateral Triangle

  • 3 sided shape where all sides are the same length.

15 of 31

Equilateral Triangle

16 of 31

Isosceles Triangle

  • A triangle with two equal sides.

17 of 31

Isosceles Triangle

A real world example:

18 of 31

Scalene Triangle

  • A scalene triangle has no sides that are the same length.

19 of 31

Right Triangle

  • A triangle that contains a right angle.

20 of 31

Right Triangle

One way that a right triangle

is used in the real world.

21 of 31

Lets see how much you know....

It is time for a quiz!

Time for you to show everyone how much you know!

22 of 31

Question #1

What type of angle is this?

a).

b).

c).

Acute

Obtuse

Right

23 of 31

Hooray! You Got It!

Question #2

24 of 31

Sorry Try Again

Go Back

25 of 31

Question #2

What type of triangle is this?

a).

b).

c).

Right Triangle

Isosceles Triangle

Scalene Triangle

26 of 31

Hooray! You Got It!

Question #3

27 of 31

Sorry Try Again

Go Back

28 of 31

Question #3

This is an equilateral triangle

a).

b).

True

False

29 of 31

Hooray! You Got It!

Resources

30 of 31

Sorry Try Again

Go Back

31 of 31

Resources

All images are from creative commons

http://www.flickr.com/

Attribution given to:

Image 1: Carol VanHook

Image 2: Lone Primate

Image 2: Elle Brown

Image 4: Katsrcool

Image 5: Origamidon

Image 6: Kevin H.

Image 7: Paloetic

Image 8: Randy Son of Robert

Image 9: Dhammza

Image 10: Hamad AL-Mohanna

Image 11: D. Sharon Pruit