Angles

​The Fun Lesson on Angles: Shapes, Turns, and Corners!

Hello future Math Masters! Today, we're going on an adventure to explore the coolest part of shapes: Angles!

1. What is an Angle?

Imagine two lines starting from the exact same point and spreading out like the hands of a clock or the blades of a pair of scissors. The space between those lines is what we call an Angle.

An angle has three main parts:

1. Vertex: This is the starting point, the sharp corner where the two lines meet. (Think of it as the V of the angle.)

2. Arms (or Sides): These are the two straight lines that spread out from the vertex.

By Vihana Keshari

​2. How Do We Measure Angles?

We use a special unit to measure angles, just like we use centimeters or inches to measure length.

This unit is called a Degree, and we write it with a little circle: o.
A full circle is 360 degree.

Angles are measured using a tool called a Protractor.

The bigger the spread between the two arms, the bigger the angle's degree measure will be!

​3. The Four Super Types of Angles
All angles fit into special categories based on how big they are. We'll learn the four main types!

​Type 1: The Right Angle 90 degree

​Type 2: The Acute Angle (Less than 90 degree)

​Type 3: The Obtuse Angle (More than 90 degree)

​Type 4: The Straight Angle (180 degree)

​Understanding Acute Angles
(Less than 90 degree):-

​Understanding 90 degree:-

​Understanding obtuse angles
(More than 90 degree):-

Multiple Choice

What does the image show?

• acute angles
• right angles
• straight angles
• obtuse angles

Multiple Choice

Which angle type is pictured?

• Acute
• Right
• Obtuse
• Straight

Multiple Choice

• The angles are acute
• The angles are right
• The angles are obtuse

Multiple Choice

• The slices are acute angles
• The slices are right angles
• The slices are obtuse angles

Multiple Choice

• Acute

• Right

• Obtuse

Multiple Choice

Which type of angle is pictured?

• Acute
• Right
• Obtuse
• Straight

Multiple Choice

Name this angle.

• acute
• right
• obtuse
• none of the above

Multiple Choice

What type of angle is this?

• ^acute
• obtuse
• right
• straight

Multiple Choice

Which angle type is pictured?

• Acute
• Right
• Obtuse
• Straight

Fill in the Blanks

Look at the picture and complete the sentence below.

The triangle above has

right angle(s).

Multiple Choice

Which correctly describes the angles that appear in the picture?

• 1 acute angle

  1 obtuse angle

  1 right angle

• 0 acute angles

  0 obtuse angles

  3 right angles

• 2 acute angles

  0 obtuse angles

  1 right angle

• 0 acute angles

  2 obtuse angles

  1 right angle

Multiple Select

Which 2-D figures have a right angle?

Multiple Choice

This is a pentagon. Pentagons have...

• 5 sides and 5 angles

• 2 sides and 3 angles

• 3 sides and 2 angles

Multiple Choice

Blue outline is an example of...

• Angle

• Line

• Ray

Multiple Choice

Is this an open or a closed shape?

• Open

• Closed

Multiple Choice

What kind of angle is this?

• obtuse angle

• acute angle

• right angle

Multiple Choice

What is the angle that we could find at this clock?

• Right angle

• Obtuse angle

• Acute angle

Multiple Choice

How many acute angles that we can see on this star?

• 4

• 5

• 7

Multiple Choice

Which clock below shows the Right angle?

Multiple Choice

The name of the angles on red circle is Obtuse Angles.

• True

• False

Multiple Choice

Classify the angle above?

• Obtuse

• Acute

• Straight

• Right

Multiple Choice

Which of the road signs below has corners formed with only acute angles?

Multiple Choice

What is the name of the angle shown above?

• Acute

• Obtuse

• Straight

• Right

Multiple Choice

which angle is of 180 degree ?

Multiple Select

Which angles are obtuse?

Select all that apply.

Multiple Choice

Does this shape have a right angle?

• Yes

• No

Multiple Choice

Does this shape have a right angle?

• Yes

• No

Multiple Choice

Does this shape have a right angle?

• Yes

• No

Multiple Choice

Does this shape have a right angle?

• Yes

• No

Multiple Choice

Does this shape have a right angle?

• Yes

• No

Multiple Choice

Does this shape have a right angle?

• Yes

• No

Categorize

Options (19)

Letter W

Letter A

Letter V

Letter X

Letter Y

Letter Z

Letter M

Letter N

Letter L

Letter T

Letter H

Letter O

Letter J

Letter K

Letter P

Letter F

Letter S

letter B

Letter C

Organize these options into the right categories

Acute Angle

Right Angle

No angle