9.1 CIRCUMFERENCE OF CIRCLES

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STEP 1: BASIC SKILLS

Page no. 447

Q. 2,4
ALEF 124,125

STEP 2 :

Circleةرئاد

Center زكرم

Circumference طيحم

Diameter رطق

Radius رطق فصن

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:455

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2 × 3.14 =

286

4
=

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•Circles are used by GPS to determine distance. It locates points
and determines their separations from the satellite using a
circle theory.

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Activity 1: Vocabulary (Radius and Diameter).

https://www.geogebra.org/m/SAk2wKJf

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Radius=

Diameter=

Radius=

Diameter=

Radius=

Diameter=

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A

B

C

D

E

F

LO: To find the circumference of circle (diameter given)

Multiple Choice

Radius=

• A ,C

• E,F

• D,E

• B,D

Multiple Choice

What is the radius?

• 18
• 72
• 38
• 14

Multiple Choice

What is the diameter?

• 8
• 16
• 10
• 4

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Activity 2: Infographics (𝝅).

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𝝅 =𝟐𝟐

𝟕

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Home

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PAGE :155

LO: To find the circumference of circle (diameter given)

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PAGE :155

LO: To find the circumference of circle (diameter given)

Multiple Choice

The diameter of a circle is 3 centimeters. What is the circumference?

• 11.5cm2
• 9.42 cm2
• unicorns are awsome
• 45.3 cm2

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LO: To find the circumference of circle (radius given)

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PAGE :155

LO: To find the circumference of circle (radius given)

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Find the circumference of the circle.

LO: To find the circumference of circle (radius given)

Multiple Choice

Which image below represents the radius of a circle?

Multiple Choice

What is the circumference?

• 48
• 96
• 24
• 18

Multiple Choice

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

• Radius

• Diameter

Multiple Select

What is/are the formula (s) for circumference?

• C = π r

• C = 2 π r

• C = π d

• C = 2 π d

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Find the circumference of the circle.

PAGE :155

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PAGE :155

LO: To find the circumference of circle

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LO: To find the circumference of circle

Multiple Choice

The image shows two circles. The diameter of Circle A measures 5 cm, and it is the same as the radius of Circle B. What is the diameter of Circle B?

• 5 cm

• 25 cm

• 10 cm

• 12.5 cm

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188.4 feet; The circumference of one ring in the model is 2 (6) = 37.68 feet. Multiply 37.68
by 5 to obtain that about 188.4 feet of rope is needed to create the model of the five rings.

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How do you feel about today's lesson

LO: To find the circumference of circle (radius given)

Page:455 . Q: 2,4,6,8
ALEF 124,125

https://www.liveworksheets.com/w/en/mathematcis/714957

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A wire is bent to form four semicircles. How long is the wire?

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LO: To find the circumference of circle (radius given)

A

B

C

D

Multiple Choice

What number is pi?

• 1.41

• 2.00

• 3.14

• 5.14

Multiple Choice

To find the circumference of the circle, which should I use?

• 3.14 x 4

• 3.14 x 4 x 3

• 3.14 x 4 x 2

Multiple Choice

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

Multiple Choice

To find the circumference of the circle, which should I use?

• 12 x 3.14

• 12 x 3.14 x 2

Multiple Choice

Find the circumference of a circle with a diameter of 11 millimeters.

• 34.6 mm
• 30 mm
• 25.3 mm
• 34.54 cm

Multiple Choice

To find the circumference of the circle, which should I use?

• 3.14 x 4

• 3.14 x 4 x 3

• 3.14 x 4 x 2

Multiple Choice

What is the circumference?

• 48

• 96

• 24

• 18

Multiple Choice

What is this symbol called?

• pi

• sigma

• radius

• omega

Multiple Choice

What is the distance around the outside of the circle called?

• Area

• Diameter

• Circumference

• Chord

Multiple Select

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

Multiple Choice

Find the circumference of the circle.

• 31.4 cm

• 78.5 cm

• 314 cm

• 15.7 cm

Multiple Choice

Find the circumference (round to the nearest hundredth).

• 2.55 cm

• 8.36 cm

• 12.56 cm

• 25.12 cm

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There are 2 formulas for the circumference of a circle

𝑎)

𝐶 = 2 𝜋𝑑

𝑏) 𝐶 = 𝜋𝑑

𝑐)

𝐶 = 𝜋𝑟2

𝑑) 𝐶 = 2𝜋𝑟

LO: To find the circumference of circle (radius given)

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Find the circumference of the circle.

LO: To find the circumference of circle (radius given)

A
B

C

D

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Find the circumference of the circle.

LO: To find the circumference of circle (radius given)

A

B

C

Extra practice -1

Circumference of circles

LO: To find the i) circumference of circles
ii) radius, diameter when circumference given

Extra practice -1

Circumference of circles

LO: To find the i) circumference of circles
ii) radius, diameter when circumference given

Extra practice -1

Circumference of circles

LO: To find the i) circumference of circles
ii) radius, diameter when circumference given