Circular measureCircular measure

Area of a Circle

Definition of radians

Click on a topic

Area of a Sector

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Definition of

Definition of

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(Pi)

nextnext

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Take any size of circle.

d

C

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C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

d

C

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C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

d

C

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C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

C

d

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C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

C

d

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C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

C

d

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C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

C

d

is about 3 times

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C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

dC

C

d

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This is true for any size of circle

C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

dC = 3.1415927 x

C

d

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This number is called (pi)

This is true for any size of circle

C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

dC = x

dC = 3.1415927 x

C

d

dC = x

= 3.1415927

dC = 3.1415927 x

This number is called (pi)

This is true for any size of circle

C is the Circumference, the distance around the outside.

d is the Diameter.

Take any size of circle.

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Definition

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S Sr

radians

r

11ccDefinitionDefinition 22cc

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33cc 44cc 55cc 66cc 1 revolution1 revolution

cc means circular measure i.e. radians means circular measure i.e. radians

Definition

ExitExit

= 1radian

11ccDefinitionDefinition

S = r

Sr

radians

r

22cc

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33cc 44cc 55cc 66cc 1 revolution1 revolution

cc means circular measure i.e. radians means circular measure i.e. radians

Definition

ExitExit

= 2 radians

11cc 22ccDefinitionDefinition

S = 2r

Sr

radians

r

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33cc 44cc 55cc 66cc 1 revolution1 revolution

cc means circular measure i.e. radians means circular measure i.e. radians

Definition

ExitExit

= 3 radians

11cc 22cc 33ccDefinitionDefinition

S = 3r

Sr

radians

r

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44cc 55cc 66cc 1 revolution1 revolution

cc means circular measure i.e. radians means circular measure i.e. radians

Definition

ExitExit

= 4 radians

11cc 22cc 33cc 44ccDefinitionDefinition

S = 4r

Sr

radians

r

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55cc 66cc 1 revolution1 revolution

cc means circular measure i.e. radians means circular measure i.e. radians

Definition

ExitExit

= 5 radians

11cc 22cc 33cc 44cc 55ccDefinitionDefinition

S = 5r

Sr

radians

r

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66cc 1 revolution1 revolution

cc means circular measure i.e. radians means circular measure i.e. radians

Definition

ExitExit

= 6 radians

11cc 22cc 33cc 44cc 55cc 66ccDefinitionDefinition

S = 6r Sr

radians

r

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1 revolution1 revolution

cc means circular measure i.e. radians means circular measure i.e. radians

Definition

ExitExit

= 2 radians

11cc 22cc 33cc 44cc 55cc 66cc 1 revolution1 revolutionDefinitionDefinition

S = 2r

Sr

radians

r

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cc means circular measure i.e. radians means circular measure i.e. radians

Area of a circle

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Show dimensionsShow dimensions

Area of a circle

Cut into sectorsCut into sectors

r

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C =2 r

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Area of a circle

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C =2 r

r

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Open outOpen out

C 2

r

= r

Area of a circleC =2 r

C 2

= r

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Push togetherPush together

Area of a circleC =2 r

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Area of rectangleArea of rectangle

r

r

r

r

Area = r2

Area of a circleC =2 r

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Area of a sector

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Show dimensionsShow dimensions

Cut into small sectorsCut into small sectors

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Area of a sector

S = rr

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Open outOpen out

Area of a sector

S = rr

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Open outOpen out

Area of a sector

r2

r2

r

r

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Push togetherPush together

Area of a sector

r2

r2

r

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Area of a sector

r2

Area of rectangleArea of rectangle

Area = ½ r2

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Area of a sector

r

r2