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2 years ago

6

A ladder is leaning against a building. The

1 answer:

arlik [135]2 years ago

3 0

Answer:α

=

71

°

:

explain:

From trigonometry we have:

cos

α

=

7

21

7

=

21

cos

(

α

)

and:

α

=

a

r

c

cos

(

7

21

)

=

70.5

≈

71

∘

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