Laws Of Sines And Cosines - HP -22S Owner's Manual

.'RADlusl
1'"=5.0990
Calculates and stores
projection length.
. 1
xCOORD I
>::=5.0000
Calculates
x
for
projection.
.lyCOORDI
y=-1.0000
Calculates y for
projection.
The projection vector is 5i -1 j.
Laws of Sines and Cosines
The law of sines and law of cosines apply to all triangles:
Law of sines:
_a_
=
_b_
=
_c_
sin A
sin B sin C
Use when you know:
• One side, two angles.
• Two sides, angle opposite a
known side.
Law of cosines:
a
2 =
b
2
+
c
2 -
2bc cos A
Use when you know:
• Two sides, angle between
them.
• Three sides.
8: Additional Examples 117