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Sine Rule - Unknown Angles SACHS
Contributed by: Shanahan
Sine Rule - Unknown Angles
* To find an angle, we
put the angles on top.
* We need to pairs of
opposite sides/angles
to apply the rule.
Sine Rule - Unknown Angles
Step 1: Input matching
angles and sides, starting
with the unknown angle.
sin θ
=
sin
o
Sine Rule - Unknown Angles
sin θ
=
Step 2: Get sin θ by itself
by multiplying the
denominator to the
other side
× sin 33
9
Sine Rule - Unknown Angles
sin θ =
[Correct to 3 d.p. Keep the full answer on the calculator]
Step 3: Input into
your calculator.
Sine Rule - Unknown Angles
[Correct to the nearest degree]
Step 4: Remove sin
by using sin-1.
θ =
o
Sine Rule - Unknown Angles
sin θ
No prompts this time!
=
sin
o
Sine Rule - Unknown Angles
sin θ =
× sin 21
21
Sine Rule - Unknown Angles
[Correct to 3 d.p. Keep the full answer on the calculator]
sin θ =
Sine Rule - Unknown Angles
[Correct to the nearest degree]
θ =
o
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