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 Teaching DemonstrationFebruary 9, 2016

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Circles

Mathematics

Grade 7

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Review

Given the trianglebelow, what are its sides?A

RC

Its sides are

CA,  AR, CR,

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What are the types of poygonsuse!"

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#b$ecti%es

  1& 'ustrate an! name a circe an! itsparts( ra!ius, !iameter, chor! an!

center2& '!entify the %arious segmentsreate! to a circe&

 

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• Discussions

• )i!eo presentation*parts of a circe

• +ractice eercises

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+arts of the Circe

centre

ra!ius

!iameter

chor!

D

C

 A

N

Y

B

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+ractice -ercises

  1& .ame the circe&

  2& .ame a ra!ius&

 /& .ame a !iameter&

 & .ame a ra!ius not !ran as part

of a !iameter&

 & 3uppose the !iameter of a circe

is 0 cm, 4n! its ra!ius&

6& 'f D+ 5 20 inches, 4n! + 

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Abstraction

  is a set of points in a gi%en

pane, each point of hich is ate7ua !istance from a 4e! pointcae! the center&is name! by its center&

  is a segment hose en!pointsare points on a circe

  is a segment hose

en!points are the center ofthe circe an! a point on thecirce&

 

is a chor! containing thecenter

of the circe is tice its

1. A circle

2. A circle

3. A chord

4. A radius

5. A diameter 

6. A diameter 

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Formati%e assessment

  1& .ame the circe&

  2& .ame a ra!ius&

 /& .ame a !iameter&

 & .ame a ra!ius not !ran as part

of a !iameter&

 & 3uppose the !iameter of a circe

is 0 cm, 4n! its ra!ius&

6& 'f D+ 5 20 inches, 4n! +

 

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Assignment

Dra !our o" circle a"d illustrate the #olloi"$

se$me"ts%

1. radius 3. chord

2. diameter 

 

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 Than8 you for

istening