21
The angle from a point 15 meters from
a building to the highest floor of the
building is 45°. How tall is the building?
Tri gonometric Functi ons
[DEG mode]
View point
A PP L IC AT I O N S:
Trigonometric functions are useful in mathematics and various engineering
calculations. T hey are often used in astronomical obser vations, civil engi-
neering and in calculations involving electrical circuits, as well as in calcula-
tions for physics such as parabolic motion and wave motion.
Trigonometric functions determine the ratio of three sides
of a right triangle. C ombination of three sides are sin, cos,
and tan. T heir relations are;
C alculates the sine of an angle.
C alculates the cosine of an angle.
C alculates the tangent of an angle.
<Example>
45 15
1
5
O per ation
D isplay
sin
θ
=
b
a
tan
θ
=
b
c
cos
θ
=
c
a
a
c
b
θ
