Casio fx-350MS Booklet

CHAPTER 8 Angles of Elevation and Depression
21
–
Ans
¡
6
0
6
2
5
tan
0
=
tan
0
4
=
=
X
An observer stands at
A
, which is at the top of a tower, AC . He sees a
car on the road at
B , which is 60m from C . The angle of depression of
B from
A
is
°25
. Calculate the height of the tower.
A traffic light is located at
D
, where CDB is a straight
line. The angle of elevation of
A
from
D
is °40 .
Calculate the distance BD .
OPERATION
1
. Calculate the height of the tower using °
=
25tan60AC .
The height of the tower is approximately 27.98m.
2. To find the distance BD, first determine CD using
CD
AC
=°40tan
.
Therefore,
CD
is approximately 33.34m.
3. The distance of CDBCBD −= .
Hence, the distance BD is approximately 26.66m.
Exam
p
le 1
60Xtan 25
27.97845949
Ans¡tan 40
33.34342961
60
–
Ans
26.65657039
60m
A
C
D
25°
B

Casio fx-350MS Specifications

General

Type	Scientific
Form factor	Pocket
Power source	Battery

Weight and Dimensions

Weight	100 g
Dimensions (WxDxH)	12.2 x 85 x 155 mm