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Introduction
· This Chapter focuses on using `Radians' when
answering questions involving circles
· Radians are an alternative to degrees
· Radians are quicker to use than degrees (when
you get used to them)
· They also allow extra calculations which would
be much more difficult to do using degrees
instead...…read more

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Radian measure and its
Applications
You can measure angles in Radians
A
r
Radians are an alternative to degrees.
Some calculations involving circles are O 1c r
easier when Radians are used, as r
opposed to degrees.
B
`If arc AB has length r, then angle
AOB is 1 radian (1c or 1 rad)'
Arc Length
Multiply by 2
Arc Length 2r is the
circumference
÷2
÷
6A…read more

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Radian measure and its
Applications
You can measure angles in Radians Convert the following
angle to degrees
You need to be able to convert
between degrees and radians.
Multiply by
180
Radians Degrees /
Top x Top,
Bottom x Bottom
Cancel out
Multiply
by 180/
Work out the
sum
6A…read more

Slide 6

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Radian measure and its
Applications
You can measure angles in Radians Convert the following
angle to degrees
You need to be able to convert
between degrees and radians.
Multiply by
180
Radians Degrees /
Top x Top,
Bottom x Bottom
Cancel out
Multiply
by 180/
Work out the
sum
6A…read more

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