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QveST [7]
3 years ago
12

Susan will rotate triangle  ABC 180°about one of the labeled points. Susan says, "The image will not touch the pre-image at all.

"
Which points could be her center of rotation?

Select each correct answer.

point C

point D

point E

point F

Mathematics
2 answers:
nadezda [96]3 years ago
5 0
Point E..............................
Bingel [31]3 years ago
5 0

Answer:

Point E

and

Point F

Step-by-step explanation:

done the topic

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loudness depends on the amplitude or height of the sound waves

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Dayren is driving to visit family. She drives at a average of 65 miles per hour. She drives 227.5 miles before lunch. And then 9
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5 hours

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First, add the miles together

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HELP <3 Match the expressions with their solutions.
densk [106]

Answer:

1 ) sin 165°

2 ) cos 330°

3 ) Tan 157.5°

4 ) sin^2 157.5

Step-by-step explanation:

1 )

Given expression is  \sqrt{\frac{1-cos330}{2} }

We know that cos2x=1-2sinx^{2}

sinx^{2}=\frac{1-cos2x}{2}

(sinx/2)^2=\frac{1-cosx}{2}

So the first expression is sin (330/2)° =sin 165°

2 )

GIven expression is  1-2sin^2165

We know that cos2x=1-2sinx^{2}

So the result is cos 330°

3 )

Given expression is \frac{1-cos 315}{sin315}

We know that cos2x=1-2sinx^{2}

Also we know that sin2x = 2sinxcosx

So The numerator becomes 2sin^2x/2. and the denominator becomes as 2sinx/2cosx/2

\frac{2sin^2x/2}{2sinx/2cosx/2}=tanx/2

So the result is Tan 157.5°

4 )

Given expression is \frac{1-cos 315}{2}

We know that cos2x=1-2sinx^{2}

(sinx/2)^2=\frac{1-cosx}{2}

So the result is sin^2 157.5

6 0
3 years ago
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