Polygons & Circles

Polygons & Circles

Tala Pawlo

Let's remember together (Polygons)

The polygons are named according to the number of side they have.

Number of side ?= Polygons name

3 = Triangle

4 = Quadrilateral

5 = Pentagon

6 = Hexagon

7 = Heptagon

8 = Octagon

9 = Nonagon

10 = Decagon

Let's remember together (Polygons)

A convex polygon is a polygon which has no interior reflex angles.

Every pair of points inside a convex polygon can be joined by a straight line segment which remain inside the polygon.

A regular polygon has all sides of equal length and all angles of equal measure

Convex polygon & Nonconvex polygon

Don't forgot

Regulars & Irregular polygons

Don't forgot

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Any Question?

• Yes

• No

Multiple Choice

Are they all Convex polygon ??

• Yes

• No

Multiple Choice

What is the name of this polygon ??

• Triangle

• Octagon

• Nonagon

• Decagon

Multiple Choice

Is this Regular polygon

• Yes

• No

Let's remember together (Polygon)

A tringle is :

Equilateral if it's side are all equal in length

Isosceles if at least two of it's side are equal in length

Scalene if none of it's side are equal in length

Let's remember together

A triangle is :

Acute angled if all of it's angles acute

Right angled if one of it's angles is right angle (90ْ)

Obtuse angled if one of it's angles is obtuse

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Any Question ??

• Yes

• No

Now let's know how we find x

For example :

The sum of the angles in triangle (180ْ)

The angle sum of triangle is 74ْ , 42ْ , xْ

First step is we add them together, which equal ( xْ + 116 = 180)

Then we subtract 116 from both side

X = 64

Let's know how to find Y

The exterior angles of triangle is ( y , 80 , 125)

First we add Y + 80 = 125

Then we substract 80 from both side

Y= 45

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Any Question ??

• Yes

• No

Now your turn to try

Focus when you answer

Find x

Focus 😋

Let's try together

It's easy

Find a

Focus 😋

Let's try together

It's easy

Try to do this one

It's easy what i think 😁

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Do you need help ??

• Yes

• No

Now try this one

it's easy what i think 😁

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Do you need help ??

• Yes

• No

Let's try it together

What you think we can do ?

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Do you want to do it together or you want to think again?

• I want to think again

• I don't know how, i want help

Remember this

Don't forgot

Remember the rule

I will let you try it alone

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Do you need help ??

• Yes

• No

Now it's time for Circle

It's easy

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Are you ready ?

• Yes

• No

Let's know about circle

Let's start

Let's try to answer

It's easy ya ?

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Any Question ?

• Yes

• No

Use pay to find the circumference of a circle

Don't forgot pay = 3.14

A) Diameter 10 cm

C = pay D

C = 3.14 × 10 cm

C= 31.4 cm

B) Radius

C = 2 pay R

C = 2 × 3.14 × 2 m

C = 12.6 m

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Any Question ?

• Yes

• No

Multiple Choice

Diameter 5 cm

• 15.7cm

• 22.0

• 18.9

• 47.1

Multiple Choice

Radius 7cm

• 52.1

• 44.0

• 18.9

• 66.0

Try to solve this

It's easy only think

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Any Question ?

• Yes

• No

Try this one

Easy

Try this one

Easy

Try this one

Easy

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Easy or let's try more

• Let's try more

• Easy

Let's try now ...

A cylindrical barrel has radius 40 cm. What is the circumference of it's base ?

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Any Question ?

• Yes

• No

Now we want to know about area

Area of a circle

Let's try to make this one

Yala

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Any Question ?

• Yes

• No

Try this one

It's easy :>

Let's try this one

Easy :>

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Before we go is there any Question ??

And do you need to make more Questions

• I have some Questions

• No

• I want more Questions

• I have Question