Page 23 - Trigonometry
P. 23
From the diagram you will recognise,
sin(180 − ) =
Therefore,
180 − = sin −1 ( )
Leaving,
= 180 − sin −1 ( ) 4
Eq:3 and Eq:4 can be calculated at the same time on
your fx calculator by using the multi-stage feature;
separation by (:). The keystrokes are,
CsQ(C)dpQ(A)d$psQ(B)
dpJ(A)d$Q(:)
180pq<J(A)aJ(B)$)
In the diagram on page 18, A = 12.67 cm, B = 15.29 cm,
C = 18.41 cm. Calculate X and the angle θ.
r
C? 18.41=
A? 12.67=
B? 15.29=
19
