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Sine Rule - Unknown Side SACHS
Contributed by: Shanahan
The Sine Rule
You need to input 2 pairs
of opposite sides and angles
to find one unknown value.
Note - when finding sides,
we choose to put the
sides on top!
The Sine Rule
sin
x
Step 1: Match up the twosets of opposite sides/angles.
o
=
sin
o
The Sine Rule
x
Step 2: To get the sides byitself, multiply the denominatorto the other side.
=
14.7 × sin
sin 20
o
The Sine Rule
[Correct to one decimal place]
Step 3: Input into yourcalculator.
=
cm
The Sine Rule
sin
x
Now, without the prompts!
o
=
sin
o
The Sine Rule
x
=
9.4 × sin
sin 43
o
The Sine Rule
[Correct to one decimal place]
x =
cm
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