Shapes Around Us

Shapes Around Us

POLYGONS

POLY - MANY

GONS - SIDES

POLYGONS

• Closed shapes that are formed using STRAIGHT lines are polygons.

• Straight lines should not cross each other.

PROPERTIES OF POLYGONS

• They can have any number of sides

• Their Sides can be of any length

Multiple Choice

A__________ is a polygon with three straight lines.

• Triangle

• Square

• Circle

Multiple Choice

Choose the properties of polygons

• Closed Shapes

• Straight Lines

• Lines Should not cross each other

• All the options

Multiple Choice

Polygons cannot have any number of sides...(True/False)

• True

• False

Multiple Choice

Polygons sides can be of any length...

• True

• False

Multiple Choice

How many types of polygons?

• 1

• 2

• 3

• 4

TYPES OF POLYGONS

Regular Polygon

Irregular Polygon

Multiple Choice

A triangle is a polygon with three straight lines.

• True

• False

Multiple Choice

Polygons with ________ straight lines are called quadrilaterals.

• 3

• 4

• 2

• 5

Multiple Choice

I have 3 sides and I am closed Shape. Who am I?

• Triangle

• Square

Multiple Choice

I have 4 sides and all are equal.. Who am I?

• Square

• Rectangle

• Triangle

Multiple Choice

I have 4 sides and my opposite sides are equal. Who am I?

• Rectangle

• Square

How shapes got its name?

• The number of sides and

• Their lengths give a specific shape to a polygon.

TRIANGLE

• It has 3 sides.

• TRI - Three

QUADRILATERAL

• SQUARE - 4 SIDES

• RECTANGLE - 4 SIDES

• QUAD - 4

• LATERAL - SIDES

REGULAR POLYGON

• Length of all sides of polygon must be equal

• Square, Equilateral Triangle...

IRREGULAR POLYGON

• Length of all sides of polygon is not equal

• Rectangle

Multiple Choice

Square is a

• Regular Polygon

• Irregular Polygon

Multiple Choice

Rectangle is a

• Regular Polygon

• Irregular Polygon

Multiple Choice

Can we say that a circle is a polygon?

• Yes

• No

To draw a circle

We need radius of the circle or Diameter of the circle

Multiple Select

Parts of a circle

• Radius

• Centre

• Diameter

• Chord

• Circumference

Multiple Choice

The distance between the centre of the circle and the outline is called the

• Radius

• Diameter

• Chord

• Circumference

Multiple Choice

The plural form of radius is (More than one radius)

• Radii

• Radiuses

• Radiuss

Multiple Choice

How many radii can you draw in a circle?

• 1

• 2

• Many

• 10

RADIUS

The radii of a circle are all of the same length.

Multiple Choice

What is the name of the line segment MN?

• Radius

• Chord

• Diameter

• Circumference

Multiple Choice

Name the centre of a circle.

• C

• B

• D

• A

Multiple Choice

What is the name of the line segment DE?

• Radius

• Longest Chord

• Circumference

• Centre

Multiple Choice

What is the diameter?

• 8
• 16
• 10
• 4

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

A quadrilateral has _________ sides

• 6

• 4

• 9

• 5

Multiple Choice

It is a straight line that touches two points of the circumference but does NOT pass through the center

• Radius

• Diameter

• Circumference

• Chord

Multiple Choice

It is the distance across the circle that passes through the center

• Radius

• Diameter

• Circumference

• Chord

Multiple Choice

It is the distance from the center to any point in the circle.

• Circumference

• Diameter

• Segment

• Radius

Multiple Choice

It is the distance around the circle. The "perimeter" of the circle.

• Chord

• Diameter

• Circumference

• Radius

Parts of a Circle

Multiple Choice

When all the sides of a polygon are equal, it is called a

• Regular Polygon

• Irregular Polygon

RECAP

• The distance between the centre and any point on the circle is called the radius

• Closed shapes with straight lines are called as polygons.

• A polygon with four sides is called a quadrilateral.

• If any two points on a circle are joined with a line, it is called the chord.

• When the sides of a polygon are different, it is called an irregular polygon.

DIAMETER

• Diameter = Radius + Radius

• Diameter = 2 Radius

• Diameter = 2 x Radius

RADIUS

• RADIUS = Half of Diameter

• Radius =  $\frac{1}{2}$  of Diameter

• Radius =  $\frac{Diameter}{2}$  

• Radius = Diameter  $\div$  2

A chord which passes through the centre of the circle is called the diameter.

A set of circles having the same centre and different radii are called concentric circles. 

A chord which passes through the centre of the circle is called the diameter.