Page 3 - Dahlia Oktaviani Ginting_4193312002_FlipBook

I I

Definition
A. In a right triangle, the sine of an angle is the ratio
between the length of the side opposite the angle and
the length of the hypotenuse.
The sine of angle  is abbreviated sin

sisi di depan sudut
sin  =
hipotenusa
From the picture above

a
=

sin
b
The sine of angle  is abbreviated sin 

From the picture above.
c
sin  =
b
B. In a right triangle, the cosine of an angle is the ratio
between the length of the side near the angle and the
length of the hypotenuse.


Cosine of angle  is abbreviated cos
sisi di dekat sudut
cos  =
hipotenusa
From the picture above
c
cos  =
b
Cosine of angle  is abbreviated cos

From the picture above
I b I
a

=
cos