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=

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l

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ANSWER

See

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Tan

AC

CG

210

10

22

1

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P

E G

2

3a

2

3a

2a

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A B

CD

E F

GH

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T

P Q

RS

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T

A B

CD

P

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A B

CD

EF

GH

4. Given a cube ABCD.EFGH withedge length a cm.Measure the anglebetween planes:

a. ABGH andABCD

b. AFH and

BDHF

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T

A B

CDP