Question

A ladder is leaning against a building. The

ladder hits the building 12 ft from the ground
The base of the ladder is 6 ft from the base of
the building. How tall is the ladder, to the
nearest tenth of a foot?

Answer 1

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

∘